diff --git a/dnn/src/cuda/convolution3d/backward_data/algo.cpp b/dnn/src/cuda/convolution3d/backward_data/algo.cpp
index 2ecc5a6a87379123bd4d4fd0464432eac7096418..62107f0f36567e68b64bc0631213f3e6a7734e2e 100644
--- a/dnn/src/cuda/convolution3d/backward_data/algo.cpp
+++ b/dnn/src/cuda/convolution3d/backward_data/algo.cpp
@@ -24,21 +24,7 @@ Convolution3DBackwardDataImpl::AlgoPack::AlgoPack() {
     for (auto &&i: cudnn) {
         all_algos.push_back(&i);
     }
-
-    all_algos.reserve(all_algos.size() * 2);
-
-    // add gconv algos by AlgoGroupConvGeneral
-    auto all_algos_data = all_algos.data();
-    for (size_t i = 1; i < all_algos.size(); ++ i) {
-        gconv.push_back({all_algos[i]});
-    }
-    for (size_t i = 1; i < all_algos.size(); ++ i) {
-        algo2gconv[all_algos[i]] = &gconv[i - 1];
-    }
-    for (auto &&i: gconv) {
-        all_algos.push_back(&i);
-    }
-    megdnn_assert(all_algos_data == all_algos.data());
+    all_algos.push_back(&group);
 
     for (auto&& algo : all_algos) {
         m_all_algos_map.emplace(algo->info().desc, algo);
@@ -61,27 +47,26 @@ Convolution3DBackwardDataImpl::AlgoPack::cudnn_from_enum(
 Convolution3DBackwardDataImpl::AlgoPack Convolution3DBackwardDataImpl::sm_algo_pack;
 
 Convolution3DBackwardDataImpl::AlgoBase::SizeArgs::SizeArgs(
-        Convolution3DBackwardDataImpl *o,
-        const TensorLayout &filter, const TensorLayout &diff,
-        const TensorLayout &grad):
-    SizeArgs(o, o->make_canonized_filter_meta(grad.ndim, filter), diff, grad)
-{
-}
+        const Convolution3DBackwardDataImpl* o, const TensorLayout& filter,
+        const TensorLayout& diff, const TensorLayout& grad)
+        : SizeArgs(o, filter, o->make_canonized_filter_meta(grad.ndim, filter),
+                   diff, grad) {}
 
 Convolution3DBackwardDataImpl::AlgoBase::SizeArgs::SizeArgs(
-        Convolution3DBackwardDataImpl *o,
-        const CanonizedFilterMeta &filter, const TensorLayout &diff,
+        const Convolution3DBackwardDataImpl *o, const TensorLayout& filter,
+        const CanonizedFilterMeta &filter_meta, const TensorLayout &diff,
         const TensorLayout &grad):
     handle{concrete_handle(o->handle())},
-    filter_meta{filter},
+    filter_meta{filter_meta},
     diff_layout{&diff},
     grad_layout{&grad},
+    filter_layout{&filter},
     opr{o}
 {
 }
 
 Convolution3DBackwardDataImpl::AlgoBase::ExecArgs::ExecArgs(
-        Convolution3DBackwardDataImpl *opr,
+        const Convolution3DBackwardDataImpl *opr,
         _megdnn_tensor_in filter,
         _megdnn_tensor_in diff,
         _megdnn_tensor_out grad,
diff --git a/dnn/src/cuda/convolution3d/backward_data/algo.h b/dnn/src/cuda/convolution3d/backward_data/algo.h
index 2cdcf87329463a58fb3bb2492b3564f882ac0a0f..41eb05daf305b3aceeafee600618e7396aeef0c7 100644
--- a/dnn/src/cuda/convolution3d/backward_data/algo.h
+++ b/dnn/src/cuda/convolution3d/backward_data/algo.h
@@ -42,31 +42,33 @@ public:
     struct SizeArgs {
         HandleImpl* handle;
         CanonizedFilterMeta filter_meta;
-        const TensorLayout *diff_layout, *grad_layout;
-        Convolution3DBackwardDataImpl* opr;
+        const TensorLayout *diff_layout, *grad_layout, *filter_layout;
+        const Convolution3DBackwardDataImpl* opr;
 
         std::string to_string() const;
         void init_desc(convolution3d::CUDNNBwdDataDescs& desc) const {
             desc.set(filter_meta, *diff_layout, *grad_layout, opr->param());
         }
-        SizeArgs(Convolution3DBackwardDataImpl* opr, const TensorLayout& filter,
-                 const TensorLayout& diff, const TensorLayout& grad);
-        SizeArgs(Convolution3DBackwardDataImpl* opr,
-                 const CanonizedFilterMeta& filter, const TensorLayout& diff,
+        SizeArgs(const Convolution3DBackwardDataImpl* opr,
+                 const TensorLayout& filter, const TensorLayout& diff,
                  const TensorLayout& grad);
+        SizeArgs(const Convolution3DBackwardDataImpl* opr,
+                 const TensorLayout& filter,
+                 const CanonizedFilterMeta& filter_meta,
+                 const TensorLayout& diff, const TensorLayout& grad);
 
         convolution3d::ForwardSizeArgs as_fwd_args() const {
-            return {handle, grad_layout, filter_meta, diff_layout,
-                    opr->param().data_type};
+            return {handle,      grad_layout, filter_layout,
+                    filter_meta, diff_layout, opr->param().data_type};
         }
     };
     struct ExecArgs : public SizeArgs {
         const TensorND *filter_tensor, *diff_tensor, *grad_tensor;
         Workspace workspace;
 
-        ExecArgs(Convolution3DBackwardDataImpl* opr, _megdnn_tensor_in filter,
-                 _megdnn_tensor_in diff, _megdnn_tensor_out grad,
-                 _megdnn_workspace workspace);
+        ExecArgs(const Convolution3DBackwardDataImpl* opr,
+                 _megdnn_tensor_in filter, _megdnn_tensor_in diff,
+                 _megdnn_tensor_out grad, _megdnn_workspace workspace);
     };
     virtual bool is_available(const SizeArgs& args) const = 0;
     virtual size_t get_workspace_in_bytes(const SizeArgs& args) const = 0;
@@ -154,29 +156,25 @@ public:
 //! implement group conv by another algo
 class Convolution3DBackwardDataImpl::AlgoGroupConvGeneral final
         : public AlgoBase {
-    AlgoBase* m_impl;
-    std::string m_name;
-
 public:
-    AlgoGroupConvGeneral(AlgoBase* impl);
-
     bool is_available(const SizeArgs& args) const override;
     size_t get_workspace_in_bytes(const SizeArgs& args) const override;
     void exec(const ExecArgs& args) const override;
+    std::vector<SearchItem> get_subopr_list(
+            const TensorLayoutArray& layouts,
+            const OperatorBase* opr) const override;
 
-    const char* name() const override { return m_name.c_str(); }
+    const char* name() const override {
+        return "CUDA:GROUP_CONV3D_BACKWARD_DATA";
+    }
 
-    static void modify_size_args(SizeArgs& args, TensorLayout& diff_pg,
-                                 TensorLayout& grad_pg);
     AlgoAttribute attribute() const override {
-        auto ret = static_cast<AlgoAttribute>(0);
-        if (m_impl->contain_attribute_all(AlgoAttribute::REPRODUCIBLE)) {
-            ret |= AlgoAttribute::REPRODUCIBLE;
-        }
-        return ret;
+        return AlgoAttribute::REPRODUCIBLE;
     }
 
     MEGDNN_DECL_ALGO_TYPE(CUDA_GROUP_CONV_GENERAL)
+private:
+    WorkspaceBundle get_workspace_bundle(void* ptr, const SizeArgs& args) const;
 };
 
 class Convolution3DBackwardDataImpl::AlgoPack : NonCopyableObj {
@@ -190,8 +188,7 @@ public:
 
     std::vector<AlgoCUDNN> cudnn;
     AlgoChanwise chanwise;
-    std::vector<AlgoGroupConvGeneral> gconv;
-    std::unordered_map<AlgoBase*, AlgoGroupConvGeneral*> algo2gconv;
+    AlgoGroupConvGeneral group;
 
     std::vector<AlgoBase*>
             //! all algorithms
diff --git a/dnn/src/cuda/convolution3d/backward_data/group_conv.cpp b/dnn/src/cuda/convolution3d/backward_data/group_conv.cpp
index 9e6d90b59facc8c835258fa0f9552d924db73c35..c4181b1368006bdf97893d8706b01b9b49fbadee 100644
--- a/dnn/src/cuda/convolution3d/backward_data/group_conv.cpp
+++ b/dnn/src/cuda/convolution3d/backward_data/group_conv.cpp
@@ -15,68 +15,121 @@ using namespace megdnn;
 using namespace cuda;
 using namespace convolution3d;
 
-void Convolution3DBackwardDataImpl::AlgoGroupConvGeneral::modify_size_args(
-        Convolution3DBackwardDataImpl::AlgoBase::SizeArgs &args,
-        TensorLayout &diff_pg, TensorLayout &grad_pg) {
-    diff_pg = *args.diff_layout;
-    grad_pg = *args.grad_layout;
+namespace {
+std::pair<TensorLayoutArray, Convolution3DBackwardDataImpl::Param>
+sub_opr_config(const Convolution3DBackwardDataImpl::AlgoBase::SizeArgs& args) {
+    SmallVector<size_t> flt_shape(0);
+    std::vector<ptrdiff_t> flt_stride(0);
+    size_t idx = 0;
+    // check if the first dim is group
+    if (args.filter_layout->ndim > args.grad_layout->ndim)
+        ++idx;
+    for (; idx < args.filter_layout->ndim; ++idx) {
+        flt_shape.push_back(args.filter_layout->shape[idx]);
+        flt_stride.push_back(args.filter_layout->stride[idx]);
+    }
+    TensorLayout filter_pg(flt_shape, flt_stride,
+                               args.filter_layout->dtype,
+                               args.filter_layout->format);
+    TensorLayout diff_pg = *args.diff_layout;
+    TensorLayout grad_pg = *args.grad_layout;
+
     auto nr_grp = args.filter_meta.group;
-    args.filter_meta.group = 1;
-    diff_pg.shape[1] /= nr_grp;
-    grad_pg.shape[1] /= nr_grp;
-    args.diff_layout = &diff_pg;
-    args.grad_layout = &grad_pg;
+    size_t c_pos = 1;
+    diff_pg.shape[c_pos] /= nr_grp;
+    grad_pg.shape[c_pos] /= nr_grp;
+
+    megdnn::param::Convolution3D param = args.opr->param();
+    param.sparse = megdnn::param::Convolution3D::Sparse::DENSE;
+    std::pair<TensorLayoutArray, Convolution3DBackwardDataImpl::Param> ret;
+    ret.first = {filter_pg, diff_pg, grad_pg};
+    ret.second = param;
+
+    return ret;
 }
 
-Convolution3DBackwardDataImpl::AlgoGroupConvGeneral::AlgoGroupConvGeneral(
-        AlgoBase *impl):
-    m_impl{impl}
-{
-    m_name = "group_conv3d:";
-    m_name += impl->name();
+std::pair<TensorLayoutArray, std::unique_ptr<Convolution3DBackwardData>>
+prepare_sub_opr(const Convolution3DBackwardDataImpl::AlgoBase::SizeArgs& args) {
+    auto conv3d_backdata_opr =
+            args.handle->create_operator<Convolution3DBackwardData>();
+    set_execution_policy<Convolution3DBackwardData, Convolution3DBackwardData*>(
+            args.opr, conv3d_backdata_opr.get());
+    auto&& config = sub_opr_config(args);
+    conv3d_backdata_opr->param() = config.second;
+
+    return {config.first, std::move(conv3d_backdata_opr)};
+}
+}  // namespace
+
+std::vector<Algorithm::SearchItem>
+Convolution3DBackwardDataImpl::AlgoGroupConvGeneral::get_subopr_list(
+        const TensorLayoutArray& layouts, const OperatorBase* opr) const {
+    AlgoBase::SizeArgs args{
+            static_cast<const Convolution3DBackwardDataImpl*>(opr), layouts[0],
+            layouts[1], layouts[2]};
+    auto&& config = sub_opr_config(args);
+
+    std::string param_str;
+    Algorithm::serialize_write_pod(config.second, param_str);
+    return {{Algorithm::OprType::CONVOLUTION3D_BACKWARD_DATA, param_str,
+             config.first}};
 }
 
 bool Convolution3DBackwardDataImpl::AlgoGroupConvGeneral::is_available(
         const SizeArgs &args) const {
     if (args.filter_meta.group <= 1)
         return false;
-    auto sub_args = args;
-    TensorLayout diff_pg, grad_pg;
-    modify_size_args(sub_args, diff_pg, grad_pg);
-    return m_impl->is_available(sub_args);
+    if (args.filter_meta.format != Param::Format::NCDHW) {
+        return false;
+    }
+
+    auto config = prepare_sub_opr(args);
+    return get_algorithm(
+            static_cast<Convolution3DBackwardDataImpl*>(config.second.get()),
+            config.first[0], config.first[1], config.first[2]);
+}
+
+WorkspaceBundle
+Convolution3DBackwardDataImpl::AlgoGroupConvGeneral::get_workspace_bundle(
+        void* ptr, const SizeArgs& args) const {
+    auto config = prepare_sub_opr(args);
+    size_t sizes = config.second->get_workspace_in_bytes(
+            config.first[0], config.first[1], config.first[2]);
+    return {ptr, {sizes}};
 }
 
-size_t Convolution3DBackwardDataImpl::AlgoGroupConvGeneral::
-get_workspace_in_bytes(const SizeArgs &args) const {
-    auto sub_args = args;
-    TensorLayout diff_pg, grad_pg;
-    modify_size_args(sub_args, diff_pg, grad_pg);
-    return m_impl->get_workspace_in_bytes(sub_args);
+size_t
+Convolution3DBackwardDataImpl::AlgoGroupConvGeneral::get_workspace_in_bytes(
+        const SizeArgs& args) const {
+    return get_workspace_bundle(nullptr, args).total_size_in_bytes();
 }
 
 void Convolution3DBackwardDataImpl::AlgoGroupConvGeneral::exec(
-        const ExecArgs &args) const {
-    auto sub_args = args;
-    TensorND tflt{*args.filter_tensor}, tdiff{*args.diff_tensor},
-             tgrad{*args.grad_tensor};
-    modify_size_args(sub_args, tdiff.layout, tgrad.layout);
-    sub_args.filter_tensor = &tflt;
-    sub_args.diff_tensor = &tdiff;
-    sub_args.grad_tensor = &tgrad;
-    auto grp = args.filter_meta.group;
-
-    auto &&fm = args.filter_meta;
-    auto strd_flt = (fm.icpg * fm.ocpg *
-            fm.spatial[0] * fm.spatial[1] * fm.spatial[2] * tflt.layout.dtype.size()),
-         strd_diff = (
-                 tdiff.layout.stride[1] * fm.ocpg * tdiff.layout.dtype.size()),
-         strd_grad = (
-                 tgrad.layout.stride[1] * fm.icpg * tgrad.layout.dtype.size());
-    for (uint32_t g = 0; g < grp; ++ g) {
-        m_impl->exec(sub_args);
-        incr_voidp(tflt.raw_ptr, strd_flt);
-        incr_voidp(tdiff.raw_ptr, strd_diff);
-        incr_voidp(tgrad.raw_ptr, strd_grad);
+        const ExecArgs& args) const {
+    auto bundle = get_workspace_bundle(args.workspace.raw_ptr, args);
+    {
+        auto config = prepare_sub_opr(args);
+        TensorND tfilter{args.filter_tensor->raw_ptr, config.first[0]};
+        TensorND tdiff{args.diff_tensor->raw_ptr, config.first[1]};
+        TensorND tgrad{args.grad_tensor->raw_ptr, config.first[2]};
+
+        size_t c_pos = 1;
+        auto grp = args.filter_meta.group;
+
+        auto&& fm = args.filter_meta;
+        auto strd_flt = (fm.icpg * fm.ocpg * fm.spatial[0] * fm.spatial[1] *
+                         fm.spatial[2] * tfilter.layout.dtype.size()),
+             strd_diff = (tdiff.layout.stride[c_pos] * fm.ocpg *
+                          tdiff.layout.dtype.size()),
+             strd_grad = (tgrad.layout.stride[c_pos] * fm.icpg *
+                          tgrad.layout.dtype.size());
+
+        for (uint32_t g = 0; g < grp; ++g) {
+            config.second->exec(tfilter, tdiff, tgrad, bundle.get_workspace(0));
+            incr_voidp(tfilter.raw_ptr, strd_flt);
+            incr_voidp(tdiff.raw_ptr, strd_diff);
+            incr_voidp(tgrad.raw_ptr, strd_grad);
+        }
     }
 }
 
diff --git a/dnn/src/cuda/convolution3d/backward_filter/algo.cpp b/dnn/src/cuda/convolution3d/backward_filter/algo.cpp
index ad9568a30dee334f63348a08bf3384f56551757b..9c07655ad4bbb3dc28f41759905e1ee27d958de3 100644
--- a/dnn/src/cuda/convolution3d/backward_filter/algo.cpp
+++ b/dnn/src/cuda/convolution3d/backward_filter/algo.cpp
@@ -26,21 +26,7 @@ Convolution3DBackwardFilterImpl::AlgoPack::AlgoPack() {
     }
 
     all_algos.push_back(&inplace_matmul);
-    all_algos.reserve(all_algos.size() * 2);
-
-    // add gconv algos by AlgoGroupConvGeneral
-    auto all_algos_data = all_algos.data();
-    for (size_t i = 1; i < all_algos.size(); ++ i) {
-        gconv.push_back({all_algos[i]});
-    }
-    for (size_t i = 1; i < all_algos.size(); ++ i) {
-        algo2gconv[all_algos[i]] = &gconv[i - 1];
-    }
-    for (auto &&i: gconv) {
-        all_algos.push_back(&i);
-    }
-    megdnn_assert(all_algos_data == all_algos.data());
-    non_cudnn_algos.push_back(all_algos.rbegin()[0]); //group inplace_matmul
+    all_algos.push_back(&group);
 
     for (auto&& algo : all_algos) {
         m_all_algos_map.emplace(algo->info().desc, algo);
@@ -64,27 +50,26 @@ Convolution3DBackwardFilterImpl::AlgoPack
 Convolution3DBackwardFilterImpl::sm_algo_pack;
 
 Convolution3DBackwardFilterImpl::AlgoBase::SizeArgs::SizeArgs(
-        Convolution3DBackwardFilterImpl *o,
+        const Convolution3DBackwardFilterImpl *o,
         const TensorLayout &src, const TensorLayout &diff,
         const TensorLayout &grad):
-    SizeArgs(o, src, diff, o->make_canonized_filter_meta(src.ndim, grad))
+    SizeArgs(o, src, diff, grad, o->make_canonized_filter_meta(src.ndim, grad))
 {
 }
 
 Convolution3DBackwardFilterImpl::AlgoBase::SizeArgs::SizeArgs(
-        Convolution3DBackwardFilterImpl *o,
-        const TensorLayout &src, const TensorLayout &diff,
-        const CanonizedFilterMeta &grad):
-    handle{concrete_handle(o->handle())},
-    src_layout{&src},
-    diff_layout{&diff},
-    grad_filter_meta{grad},
-    opr{o}
-{
-}
+        const Convolution3DBackwardFilterImpl* o, const TensorLayout& src,
+        const TensorLayout& diff, const TensorLayout& grad,
+        const CanonizedFilterMeta& grad_meta)
+        : handle{concrete_handle(o->handle())},
+          src_layout{&src},
+          diff_layout{&diff},
+          grad_layout{&grad},
+          grad_filter_meta{grad_meta},
+          opr{o} {}
 
 Convolution3DBackwardFilterImpl::AlgoBase::ExecArgs::ExecArgs(
-        Convolution3DBackwardFilterImpl *opr,
+        const Convolution3DBackwardFilterImpl *opr,
         _megdnn_tensor_in src,
         _megdnn_tensor_in diff,
         _megdnn_tensor_out grad,
diff --git a/dnn/src/cuda/convolution3d/backward_filter/algo.h b/dnn/src/cuda/convolution3d/backward_filter/algo.h
index d3c5c398402886a4ae7ab3bd43a4916876b09239..e1f5b3bafb359402cf1ec061e73f578ee86c961e 100644
--- a/dnn/src/cuda/convolution3d/backward_filter/algo.h
+++ b/dnn/src/cuda/convolution3d/backward_filter/algo.h
@@ -36,31 +36,34 @@ public:
 
     struct SizeArgs {
         HandleImpl* handle;
-        const TensorLayout *src_layout, *diff_layout;
+        const TensorLayout *src_layout, *diff_layout, *grad_layout;
         CanonizedFilterMeta grad_filter_meta;
-        Convolution3DBackwardFilterImpl* opr;
+        const Convolution3DBackwardFilterImpl* opr;
 
         std::string to_string() const;
         void init_desc(convolution3d::CUDNNBwdFilterDescs& desc) const {
             desc.set(*src_layout, *diff_layout, grad_filter_meta, opr->param());
         }
-        SizeArgs(Convolution3DBackwardFilterImpl* opr, const TensorLayout& src,
-                 const TensorLayout& diff, const TensorLayout& grad);
-        SizeArgs(Convolution3DBackwardFilterImpl* opr, const TensorLayout& src,
-                 const TensorLayout& diff, const CanonizedFilterMeta& grad);
+        SizeArgs(const Convolution3DBackwardFilterImpl* opr,
+                 const TensorLayout& src, const TensorLayout& diff,
+                 const TensorLayout& grad);
+        SizeArgs(const Convolution3DBackwardFilterImpl* opr,
+                 const TensorLayout& src, const TensorLayout& diff,
+                 const TensorLayout& grad,
+                 const CanonizedFilterMeta& grad_meta);
 
         convolution3d::ForwardSizeArgs as_fwd_args() const {
-            return {handle, src_layout, grad_filter_meta, diff_layout,
-                    opr->param().data_type};
+            return {handle,           src_layout,  grad_layout,
+                    grad_filter_meta, diff_layout, opr->param().data_type};
         }
     };
     struct ExecArgs : public SizeArgs {
         const TensorND *src_tensor, *diff_tensor, *grad_tensor;
         Workspace workspace;
 
-        ExecArgs(Convolution3DBackwardFilterImpl* opr, _megdnn_tensor_in src,
-                 _megdnn_tensor_in diff, _megdnn_tensor_out grad,
-                 _megdnn_workspace workspace);
+        ExecArgs(const Convolution3DBackwardFilterImpl* opr,
+                 _megdnn_tensor_in src, _megdnn_tensor_in diff,
+                 _megdnn_tensor_out grad, _megdnn_workspace workspace);
     };
     virtual bool is_available(const SizeArgs& args) const = 0;
     virtual size_t get_workspace_in_bytes(const SizeArgs& args) const = 0;
@@ -162,30 +165,25 @@ public:
 //! implement group conv by another algo
 class Convolution3DBackwardFilterImpl::AlgoGroupConvGeneral final
         : public AlgoBase {
-    AlgoBase* m_impl;
-    std::string m_name;
-
 public:
-    AlgoGroupConvGeneral(AlgoBase* impl);
-
     bool is_available(const SizeArgs& args) const override;
     size_t get_workspace_in_bytes(const SizeArgs& args) const override;
     void exec(const ExecArgs& args) const override;
+    std::vector<SearchItem> get_subopr_list(
+            const TensorLayoutArray& layouts,
+            const OperatorBase* opr) const override;
 
-    const char* name() const override { return m_name.c_str(); }
+    const char* name() const override {
+        return "CUDA:GROUP_CONV3D_BACKWARD_FILTER";
+    }
 
     AlgoAttribute attribute() const override {
-        auto ret = static_cast<AlgoAttribute>(0);
-        if (m_impl->contain_attribute_all(AlgoAttribute::REPRODUCIBLE)) {
-            ret |= AlgoAttribute::REPRODUCIBLE;
-        }
-        return ret;
+        return AlgoAttribute::REPRODUCIBLE;
     }
 
-    static void modify_size_args(SizeArgs& args, TensorLayout& src_pg,
-                                 TensorLayout& diff_pg);
-
     MEGDNN_DECL_ALGO_TYPE(CUDA_GROUP_CONV_GENERAL)
+private:
+    WorkspaceBundle get_workspace_bundle(void* ptr, const SizeArgs& args) const;
 };
 
 class Convolution3DBackwardFilterImpl::AlgoPack : NonCopyableObj {
@@ -200,8 +198,7 @@ public:
     std::vector<AlgoCUDNN> cudnn;
     AlgoInplaceMatmul inplace_matmul;
     AlgoChanwise chanwise;
-    std::vector<AlgoGroupConvGeneral> gconv;
-    std::unordered_map<AlgoBase*, AlgoGroupConvGeneral*> algo2gconv;
+    AlgoGroupConvGeneral group;
 
     std::vector<AlgoBase*>
             //! all algorithms
diff --git a/dnn/src/cuda/convolution3d/backward_filter/group_conv.cpp b/dnn/src/cuda/convolution3d/backward_filter/group_conv.cpp
index eaf4ea92f142b4f31142140114cd02ab0d000a97..d9564b4a4625d6d992264fb7587085b258a989e0 100644
--- a/dnn/src/cuda/convolution3d/backward_filter/group_conv.cpp
+++ b/dnn/src/cuda/convolution3d/backward_filter/group_conv.cpp
@@ -15,69 +15,123 @@ using namespace megdnn;
 using namespace cuda;
 using namespace convolution3d;
 
-void Convolution3DBackwardFilterImpl::AlgoGroupConvGeneral::modify_size_args(
-        Convolution3DBackwardFilterImpl::AlgoBase::SizeArgs &args,
-        TensorLayout &src_pg, TensorLayout &diff_pg) {
-    src_pg = *args.src_layout;
-    diff_pg = *args.diff_layout;
+namespace {
+std::pair<TensorLayoutArray, Convolution3DBackwardFilterImpl::Param>
+sub_opr_config(
+        const Convolution3DBackwardFilterImpl::AlgoBase::SizeArgs& args) {
+    SmallVector<size_t> flt_shape(0);
+    std::vector<ptrdiff_t> flt_stride(0);
+    size_t idx = 0;
+    // check if the first dim is group
+    if (args.grad_layout->ndim > args.src_layout->ndim)
+        ++idx;
+    for (; idx < args.grad_layout->ndim; ++idx) {
+        flt_shape.push_back(args.grad_layout->shape[idx]);
+        flt_stride.push_back(args.grad_layout->stride[idx]);
+    }
+    TensorLayout grad_pg(flt_shape, flt_stride, args.grad_layout->dtype,
+                         args.grad_layout->format);
+    TensorLayout src_pg = *args.src_layout;
+    TensorLayout diff_pg = *args.diff_layout;
+
     auto nr_grp = args.grad_filter_meta.group;
-    args.grad_filter_meta.group = 1;
-    src_pg.shape[1] /= nr_grp;
-    diff_pg.shape[1] /= nr_grp;
-    args.src_layout = &src_pg;
-    args.diff_layout = &diff_pg;
+    size_t c_pos = 1;
+    src_pg.shape[c_pos] /= nr_grp;
+    diff_pg.shape[c_pos] /= nr_grp;
+
+    megdnn::param::Convolution3D param = args.opr->param();
+    param.sparse = megdnn::param::Convolution3D::Sparse::DENSE;
+    std::pair<TensorLayoutArray, Convolution3DBackwardFilterImpl::Param> ret;
+    ret.first = {src_pg, diff_pg, grad_pg};
+    ret.second = param;
+
+    return ret;
 }
 
-Convolution3DBackwardFilterImpl::AlgoGroupConvGeneral::AlgoGroupConvGeneral(
-        AlgoBase *impl):
-    m_impl{impl}
-{
-    m_name = "group_conv3d:";
-    m_name += impl->name();
+std::pair<TensorLayoutArray, std::unique_ptr<Convolution3DBackwardFilter>>
+prepare_sub_opr(
+        const Convolution3DBackwardFilterImpl::AlgoBase::SizeArgs& args) {
+    auto conv3d_backfilter_opr =
+            args.handle->create_operator<Convolution3DBackwardFilter>();
+    set_execution_policy<Convolution3DBackwardFilter,
+                         Convolution3DBackwardFilter*>(
+            args.opr, conv3d_backfilter_opr.get());
+    auto&& config = sub_opr_config(args);
+    conv3d_backfilter_opr->param() = config.second;
+
+    return {config.first, std::move(conv3d_backfilter_opr)};
+}
+}  // namespace
+
+std::vector<Algorithm::SearchItem>
+Convolution3DBackwardFilterImpl::AlgoGroupConvGeneral::get_subopr_list(
+        const TensorLayoutArray& layouts, const OperatorBase* opr) const {
+    AlgoBase::SizeArgs args{
+            static_cast<const Convolution3DBackwardFilterImpl*>(opr),
+            layouts[0], layouts[1], layouts[2]};
+    auto&& config = sub_opr_config(args);
+
+    std::string param_str;
+    Algorithm::serialize_write_pod(config.second, param_str);
+    return {{Algorithm::OprType::CONVOLUTION3D_BACKWARD_FILTER, param_str,
+             config.first}};
 }
 
 bool Convolution3DBackwardFilterImpl::AlgoGroupConvGeneral::is_available(
-        const SizeArgs &args) const {
+        const SizeArgs& args) const {
     if (args.grad_filter_meta.group <= 1)
         return false;
-    auto sub_args = args;
-    TensorLayout src_pg, diff_pg;
-    modify_size_args(sub_args, src_pg, diff_pg);
-    return m_impl->is_available(sub_args);
+    if (args.grad_filter_meta.format != Param::Format::NCDHW) {
+        return false;
+    }
+
+    auto config = prepare_sub_opr(args);
+    return get_algorithm(
+            static_cast<Convolution3DBackwardFilterImpl*>(config.second.get()),
+            config.first[0], config.first[1], config.first[2]);
+}
+
+WorkspaceBundle
+Convolution3DBackwardFilterImpl::AlgoGroupConvGeneral::get_workspace_bundle(
+        void* ptr, const SizeArgs& args) const {
+    auto config = prepare_sub_opr(args);
+    size_t sizes = config.second->get_workspace_in_bytes(
+            config.first[0], config.first[1], config.first[2]);
+    return {ptr, {sizes}};
 }
 
-size_t Convolution3DBackwardFilterImpl::AlgoGroupConvGeneral::
-get_workspace_in_bytes(const SizeArgs &args) const {
-    auto sub_args = args;
-    TensorLayout src_pg, diff_pg;
-    modify_size_args(sub_args, src_pg, diff_pg);
-    return m_impl->get_workspace_in_bytes(sub_args);
+size_t
+Convolution3DBackwardFilterImpl::AlgoGroupConvGeneral::get_workspace_in_bytes(
+        const SizeArgs& args) const {
+    return get_workspace_bundle(nullptr, args).total_size_in_bytes();
 }
 
 void Convolution3DBackwardFilterImpl::AlgoGroupConvGeneral::exec(
-        const ExecArgs &args) const {
-    auto sub_args = args;
-    TensorND tsrc{*args.src_tensor}, tdiff{*args.diff_tensor},
-             tgrad{*args.grad_tensor};
-    modify_size_args(sub_args, tsrc.layout, tdiff.layout);
-    sub_args.src_tensor = &tsrc;
-    sub_args.diff_tensor = &tdiff;
-    sub_args.grad_tensor = &tgrad;
-
-    auto &&fm = args.grad_filter_meta;
-    auto grp = fm.group;
-
-    auto strd_src = (
-                 tsrc.layout.stride[1] * fm.icpg * tsrc.layout.dtype.size()),
-         strd_diff = (
-                 tdiff.layout.stride[1] * fm.ocpg * tdiff.layout.dtype.size()),
-         strd_grad = (fm.icpg * fm.ocpg *
-                 fm.spatial[0] * fm.spatial[1] * fm.spatial[2] * tgrad.layout.dtype.size());
-    for (uint32_t g = 0; g < grp; ++ g) {
-        m_impl->exec(sub_args);
-        incr_voidp(tsrc.raw_ptr, strd_src);
-        incr_voidp(tdiff.raw_ptr, strd_diff);
-        incr_voidp(tgrad.raw_ptr, strd_grad);
+        const ExecArgs& args) const {
+    auto bundle = get_workspace_bundle(args.workspace.raw_ptr, args);
+    {
+        auto config = prepare_sub_opr(args);
+        TensorND tsrc{args.src_tensor->raw_ptr, config.first[0]};
+        TensorND tdiff{args.diff_tensor->raw_ptr, config.first[1]};
+        TensorND tgrad{args.grad_tensor->raw_ptr, config.first[2]};
+
+        size_t c_pos = 1;
+        auto grp = args.grad_filter_meta.group;
+
+        auto&& fm = args.grad_filter_meta;
+        auto strd_src = (tsrc.layout.stride[c_pos] * fm.icpg *
+                         tsrc.layout.dtype.size()),
+             strd_diff = (tdiff.layout.stride[c_pos] * fm.ocpg *
+                          tdiff.layout.dtype.size()),
+             strd_grad = (fm.icpg * fm.ocpg * fm.spatial[0] * fm.spatial[1] *
+                          fm.spatial[2] * tgrad.layout.dtype.size());
+
+        for (uint32_t g = 0; g < grp; ++g) {
+            config.second->exec(tsrc, tdiff, tgrad, bundle.get_workspace(0));
+            incr_voidp(tsrc.raw_ptr, strd_src);
+            incr_voidp(tdiff.raw_ptr, strd_diff);
+            incr_voidp(tgrad.raw_ptr, strd_grad);
+        }
     }
 }
 
diff --git a/dnn/src/cuda/convolution3d/forward/algo.cpp b/dnn/src/cuda/convolution3d/forward/algo.cpp
index e8639f82dd196f3fe49ca8a03dc07065339ec79a..3c3f749850df3bba8c224bcc1205c0809748895b 100644
--- a/dnn/src/cuda/convolution3d/forward/algo.cpp
+++ b/dnn/src/cuda/convolution3d/forward/algo.cpp
@@ -28,22 +28,7 @@ Convolution3DForwardImpl::AlgoPack::AlgoPack() {
     }
     all_algos.push_back(&inplace_matmul);
     all_algos.push_back(&a1x1x1);
-    all_algos.reserve(all_algos.size() * 2);
-
-    // add gconv algos by AlgoGroupConvGeneral
-    auto all_algos_data = all_algos.data();
-    for (size_t i = 1; i < all_algos.size(); ++ i) {
-        gconv.push_back({all_algos[i]});
-    }
-    for (size_t i = 1; i < all_algos.size(); ++ i) {
-        algo2gconv[all_algos[i]] = &gconv[i - 1];
-    }
-    for (auto &&i: gconv) {
-        all_algos.push_back(&i);
-    }
-    megdnn_assert(all_algos_data == all_algos.data());
-    non_cudnn_algos.push_back(all_algos.rbegin()[1]); // group inplace_matmul
-    non_cudnn_algos.push_back(all_algos.rbegin()[0]); // group 1x1x1
+    all_algos.push_back(&group);
 
     for (auto&& algo : all_algos) {
         m_all_algos_map.emplace(algo->info().desc, algo);
@@ -66,28 +51,25 @@ Convolution3DForwardImpl::AlgoPack::cudnn_from_enum(
 Convolution3DForwardImpl::AlgoPack Convolution3DForwardImpl::sm_algo_pack;
 
 Convolution3DForwardImpl::AlgoBase::SizeArgs::SizeArgs(
-        Convolution3DForwardImpl *o,
-        const TensorLayout &src, const TensorLayout &filter,
-        const TensorLayout &dst):
-    SizeArgs(o, src, o->make_canonized_filter_meta(src.ndim, filter), dst)
-{
-}
+        const Convolution3DForwardImpl* o, const TensorLayout& src,
+        const TensorLayout& filter, const TensorLayout& dst)
+        : SizeArgs(o, src, filter,
+                   o->make_canonized_filter_meta(src.ndim, filter), dst) {}
 
 Convolution3DForwardImpl::AlgoBase::SizeArgs::SizeArgs(
-        Convolution3DForwardImpl *o,
-        const TensorLayout &src, const CanonizedFilterMeta &filter,
-        const TensorLayout &dst):
-    ForwardSizeArgs{
-        concrete_handle(o->handle()),
-        &src, filter, &dst,
-        o->param().data_type
-    },
-    opr{o}
-{
-}
+        const Convolution3DForwardImpl* o, const TensorLayout& src,
+        const TensorLayout& filter, const CanonizedFilterMeta& filter_meta,
+        const TensorLayout& dst)
+        : ForwardSizeArgs{concrete_handle(o->handle()),
+                          &src,
+                          &filter,
+                          filter_meta,
+                          &dst,
+                          o->param().data_type},
+          opr{o} {}
 
 Convolution3DForwardImpl::AlgoBase::ExecArgs::ExecArgs(
-        Convolution3DForwardImpl *opr,
+        const Convolution3DForwardImpl *opr,
         _megdnn_tensor_in src,
         _megdnn_tensor_in filter,
         _megdnn_tensor_out dst,
diff --git a/dnn/src/cuda/convolution3d/forward/algo.h b/dnn/src/cuda/convolution3d/forward/algo.h
index 96048e98af08896bdbfed23ba1b41eab7a423ba5..2fdfcbc0949b1ad95071b0e48d9d6449b0e0652b 100644
--- a/dnn/src/cuda/convolution3d/forward/algo.h
+++ b/dnn/src/cuda/convolution3d/forward/algo.h
@@ -48,22 +48,24 @@ public:
 
     AlgoBase() : Algorithm() { m_handle_type = Handle::HandleType::CUDA; }
     struct SizeArgs : public convolution3d::ForwardSizeArgs {
-        Convolution3DForwardImpl* opr;
+        const Convolution3DForwardImpl* opr;
 
         std::string to_string() const;
         void init_desc(convolution3d::CUDNNForwardDescs& desc) const {
             desc.set(*src_layout, filter_meta, *dst_layout, opr->param());
         }
-        SizeArgs(Convolution3DForwardImpl* opr, const TensorLayout& src,
+        SizeArgs(const Convolution3DForwardImpl* opr, const TensorLayout& src,
                  const TensorLayout& filter, const TensorLayout& dst);
-        SizeArgs(Convolution3DForwardImpl* opr, const TensorLayout& src,
-                 const CanonizedFilterMeta& filter, const TensorLayout& dst);
+        SizeArgs(const Convolution3DForwardImpl* opr, const TensorLayout& src,
+                 const TensorLayout& filter,
+                 const CanonizedFilterMeta& filter_meta,
+                 const TensorLayout& dst);
     };
     struct ExecArgs : public SizeArgs {
         const TensorND *src_tensor, *filter_tensor, *dst_tensor;
         Workspace workspace;
 
-        ExecArgs(Convolution3DForwardImpl* opr, _megdnn_tensor_in src,
+        ExecArgs(const Convolution3DForwardImpl* opr, _megdnn_tensor_in src,
                  _megdnn_tensor_in filter, _megdnn_tensor_out dst,
                  _megdnn_workspace workspace);
     };
@@ -114,35 +116,22 @@ public:
 
 //! implement group conv by another algo
 class Convolution3DForwardImpl::AlgoGroupConvGeneral final : public AlgoBase {
-    AlgoBase* m_impl;
-    std::string m_name;
-
 public:
-    AlgoGroupConvGeneral(AlgoBase* impl);
-
     bool is_available(const SizeArgs& args) const override;
     size_t get_workspace_in_bytes(const SizeArgs& args) const override;
     void exec(const ExecArgs& args) const override;
+    std::vector<SearchItem> get_subopr_list(
+            const TensorLayoutArray& layouts,
+            const OperatorBase* opr) const override;
 
-    const char* name() const override { return m_name.c_str(); }
+    const char* name() const override { return "CUDA:GROUP_CONV3D_FORWARD"; }
 
     AlgoAttribute attribute() const override {
-        auto ret = AlgoAttribute::DEFAULT;
-        if (m_impl->contain_attribute_all(AlgoAttribute::REPRODUCIBLE)) {
-            ret |= AlgoAttribute::REPRODUCIBLE;
-        }
-#define cb(attr)                               \
-    if (m_impl->contain_attribute_all(attr)) { \
-        ret |= attr;                           \
-    }
-        MEGDNN_FOREACH_ALGO_ATTRIBUTE_INHERITABLE(cb)
-#undef cb
-
-        return ret;
+        return AlgoAttribute::REPRODUCIBLE;
     }
-    static void modify_size_args(SizeArgs& args, TensorLayout& src_pg,
-                                 TensorLayout& dst_pg);
     MEGDNN_DECL_ALGO_TYPE(CUDA_GROUP_CONV_GENERAL)
+private:
+    WorkspaceBundle get_workspace_bundle(void* ptr, const SizeArgs& args) const;
 };
 
 class Convolution3DForwardImpl::AlgoCUDNN final : public AlgoBase {
@@ -226,8 +215,7 @@ public:
     Algo1x1x1 a1x1x1;
     AlgoInplaceMatmul inplace_matmul;
     AlgoChanwise chanwise;
-    std::vector<AlgoGroupConvGeneral> gconv;
-    std::unordered_map<AlgoBase*, AlgoGroupConvGeneral*> algo2gconv;
+    AlgoGroupConvGeneral group;
 
     std::vector<AlgoBase*>
             //! all algorithms
diff --git a/dnn/src/cuda/convolution3d/forward/group_conv.cpp b/dnn/src/cuda/convolution3d/forward/group_conv.cpp
index c20cb37e55bd95b41403d8bd3df10a77b898a9cc..b614b6880405c445f3382db37dfeec0e63e6d497 100644
--- a/dnn/src/cuda/convolution3d/forward/group_conv.cpp
+++ b/dnn/src/cuda/convolution3d/forward/group_conv.cpp
@@ -15,84 +15,136 @@ using namespace megdnn;
 using namespace cuda;
 using namespace convolution3d;
 
-void Convolution3DForwardImpl::AlgoGroupConvGeneral::modify_size_args(
-        Convolution3DForwardImpl::AlgoBase::SizeArgs &args,
-        TensorLayout &src_pg, TensorLayout &dst_pg) {
-    src_pg = *args.src_layout;
-    dst_pg = *args.dst_layout;
+namespace {
+std::pair<TensorLayoutArray, Convolution3DForwardImpl::Param> sub_opr_config(
+        const Convolution3DForwardImpl::AlgoBase::SizeArgs& args) {
+    TensorLayout src_pg = *args.src_layout;
+
+    SmallVector<size_t> flt_shape(0);
+    std::vector<ptrdiff_t> flt_stride(0);
+    size_t idx = 0;
+    // check if the first dim is group
+    if (args.filter_layout->ndim > args.src_layout->ndim)
+        ++idx;
+    for (; idx < args.filter_layout->ndim; ++idx) {
+        flt_shape.push_back(args.filter_layout->shape[idx]);
+        flt_stride.push_back(args.filter_layout->stride[idx]);
+    }
+    TensorLayout filter_pg(flt_shape, flt_stride,
+                               args.filter_layout->dtype,
+                               args.filter_layout->format);
+    TensorLayout dst_pg = *args.dst_layout;
+
     auto nr_grp = args.filter_meta.group;
-    args.filter_meta.group = 1;
     size_t c_pos;
-    if (args.filter_meta.format == Param::Format::NCDHW) {
+    if (args.filter_meta.format == param::Convolution3D::Format::NCDHW) {
         c_pos = 1;
     } else {
-        megdnn_assert(args.filter_meta.format == Param::Format::NDHWC,
+        megdnn_assert(
+                args.filter_meta.format == param::Convolution3D::Format::NDHWC,
                 "invalid conv format");
         c_pos = 4;
     }
     src_pg.shape[c_pos] /= nr_grp;
     dst_pg.shape[c_pos] /= nr_grp;
-    args.src_layout = &src_pg;
-    args.dst_layout = &dst_pg;
+
+    megdnn::param::Convolution3D param = args.opr->param();
+    param.sparse = megdnn::param::Convolution3D::Sparse::DENSE;
+    std::pair<TensorLayoutArray, Convolution3DForwardImpl::Param> ret;
+    ret.first = {src_pg, filter_pg, dst_pg};
+    ret.second = param;
+
+    return ret;
+}
+
+std::pair<TensorLayoutArray, std::unique_ptr<Convolution3DForward>>
+prepare_sub_opr(const Convolution3DForwardImpl::AlgoBase::SizeArgs& args) {
+    auto conv3d_opr = args.handle->create_operator<Convolution3D>();
+    set_execution_policy<Convolution3DForward, Convolution3DForward*>(
+            args.opr, conv3d_opr.get());
+    auto&& config = sub_opr_config(args);
+    conv3d_opr->param() = config.second;
+
+    return {config.first, std::move(conv3d_opr)};
 }
+}  // namespace
+
+std::vector<Algorithm::SearchItem>
+Convolution3DForwardImpl::AlgoGroupConvGeneral::get_subopr_list(
+        const TensorLayoutArray& layouts, const OperatorBase* opr) const {
+    AlgoBase::SizeArgs args{static_cast<const Convolution3DForwardImpl*>(opr),
+                            layouts[0], layouts[1], layouts[2]};
+    auto&& config = sub_opr_config(args);
 
-Convolution3DForwardImpl::AlgoGroupConvGeneral::AlgoGroupConvGeneral(
-        AlgoBase *impl):
-    m_impl{impl} {
-    m_name = "group_conv3d:";
-    m_name += impl->name();
+    std::string param_str;
+    Algorithm::serialize_write_pod(config.second, param_str);
+    return {{Algorithm::OprType::CONVOLUTION3D_FORWARD, param_str,
+             config.first}};
 }
 
 bool Convolution3DForwardImpl::AlgoGroupConvGeneral::is_available(
         const SizeArgs &args) const {
     if (args.filter_meta.group <= 1)
         return false;
-    auto sub_args = args;
-    TensorLayout src_pg, dst_pg;
-    modify_size_args(sub_args, src_pg, dst_pg);
-    return m_impl->is_available(sub_args);
+    if (args.filter_meta.format != Param::Format::NCDHW &&
+        args.filter_meta.format != Param::Format::NDHWC) {
+        return false;
+    }
+
+    auto config = prepare_sub_opr(args);
+    return get_algorithm(
+            static_cast<Convolution3DForwardImpl*>(config.second.get()),
+            config.first[0], config.first[1], config.first[2]);
+}
+
+WorkspaceBundle
+Convolution3DForwardImpl::AlgoGroupConvGeneral::get_workspace_bundle(
+        void* ptr, const SizeArgs& args) const {
+    auto config = prepare_sub_opr(args);
+    size_t sizes = config.second->get_workspace_in_bytes(
+            config.first[0], config.first[1], config.first[2]);
+    return {ptr, {sizes}};
 }
 
 size_t Convolution3DForwardImpl::AlgoGroupConvGeneral::get_workspace_in_bytes(
-        const SizeArgs &args) const {
-    auto sub_args = args;
-    TensorLayout src_pg, dst_pg;
-    modify_size_args(sub_args, src_pg, dst_pg);
-    return m_impl->get_workspace_in_bytes(sub_args);
+        const SizeArgs& args) const {
+    return get_workspace_bundle(nullptr, args).total_size_in_bytes();
 }
 
 void Convolution3DForwardImpl::AlgoGroupConvGeneral::exec(
-        const ExecArgs &args) const {
-    auto sub_args = args;
-    TensorND tsrc{*args.src_tensor}, tdst{*args.dst_tensor},
-             tflt{*args.filter_tensor};
-    modify_size_args(sub_args, tsrc.layout, tdst.layout);
-    sub_args.src_tensor = &tsrc;
-    sub_args.dst_tensor = &tdst;
-    sub_args.filter_tensor = &tflt;
+        const ExecArgs& args) const {
+    auto bundle = get_workspace_bundle(args.workspace.raw_ptr, args);
+    {
+        auto config = prepare_sub_opr(args);
+        TensorND tsrc{args.src_tensor->raw_ptr, config.first[0]};
+        TensorND tfilter{args.filter_tensor->raw_ptr, config.first[1]};
+        TensorND tdst{args.dst_tensor->raw_ptr, config.first[2]};
 
-    size_t c_pos;
-    if (args.filter_meta.format == Param::Format::NCDHW) {
-        c_pos = 1;
-    } else {
-        megdnn_assert(args.filter_meta.format == Param::Format::NDHWC,
-                "invalid conv format");
-        c_pos = 4;
-    }
+        size_t c_pos;
+        if (args.filter_meta.format == Param::Format::NCDHW) {
+            c_pos = 1;
+        } else {
+            megdnn_assert(args.filter_meta.format == Param::Format::NDHWC,
+                          "invalid conv format");
+            c_pos = 4;
+        }
+
+        auto grp = args.filter_meta.group;
+
+        auto&& fm = args.filter_meta;
+        auto strd_src = tsrc.layout.stride[c_pos] * fm.icpg *
+                        tsrc.layout.dtype.size(),
+             strd_dst = tdst.layout.stride[c_pos] * fm.ocpg *
+                        tdst.layout.dtype.size(),
+             strd_flt = fm.icpg * fm.ocpg * fm.spatial[0] * fm.spatial[1] *
+                        fm.spatial[2] * tfilter.layout.dtype.size();
 
-    auto grp = args.filter_meta.group;
-
-    auto &&fm = args.filter_meta;
-    auto strd_src = tsrc.layout.stride[c_pos] * fm.icpg * tsrc.layout.dtype.size(),
-         strd_dst = tdst.layout.stride[c_pos] * fm.ocpg * tdst.layout.dtype.size(),
-         strd_flt = fm.icpg * fm.ocpg *
-             fm.spatial[0] * fm.spatial[1] * fm.spatial[2] * 
-             tflt.layout.dtype.size();
-    for (uint32_t g = 0; g < grp; ++ g) {
-        m_impl->exec(sub_args);
-        incr_voidp(tsrc.raw_ptr, strd_src);
-        incr_voidp(tdst.raw_ptr, strd_dst);
-        incr_voidp(tflt.raw_ptr, strd_flt);
+        for (uint32_t g = 0; g < grp; ++g) {
+            config.second->exec(tsrc, tfilter, tdst, bundle.get_workspace(0));
+            incr_voidp(tsrc.raw_ptr, strd_src);
+            incr_voidp(tdst.raw_ptr, strd_dst);
+            incr_voidp(tfilter.raw_ptr, strd_flt);
+        }
     }
 }
 
diff --git a/dnn/src/cuda/convolution3d/helper.h b/dnn/src/cuda/convolution3d/helper.h
index e8f68ccf32ff986b3a534fc8e495101b2e584ade..7a7567be52d8cb88ebccc3aa28f3e7d0a6424303 100644
--- a/dnn/src/cuda/convolution3d/helper.h
+++ b/dnn/src/cuda/convolution3d/helper.h
@@ -26,6 +26,7 @@ namespace convolution3d {
     struct ForwardSizeArgs {
         HandleImpl *handle;
         const TensorLayout *src_layout;
+        const TensorLayout *filter_layout;
         CanonizedFilterMeta filter_meta;
         const TensorLayout *dst_layout;
         param::Convolution3D::DataType data_type;
diff --git a/dnn/src/cuda/convolution3d/opr_impl.cpp b/dnn/src/cuda/convolution3d/opr_impl.cpp
index c7719d6e19758999d40486bdac0409af27fcc569..cc883fb1e0085bc9cb1de650598837230f71c0e2 100644
--- a/dnn/src/cuda/convolution3d/opr_impl.cpp
+++ b/dnn/src/cuda/convolution3d/opr_impl.cpp
@@ -35,16 +35,6 @@ Convolution3DForwardImpl::get_algorithm_heuristic(
         const TensorLayout& dst, size_t workspace_limit_in_bytes,
         const AlgoAttribute& positive_attr,
         const AlgoAttribute& negative_attr) {
-    auto fm = check_layout_fwd(src, filter, dst);
-    return get_algorithm_heuristic(src, fm, dst, workspace_limit_in_bytes,
-                                   positive_attr, negative_attr);
-}
-Convolution3DForwardImpl::Algorithm*
-Convolution3DForwardImpl::get_algorithm_heuristic(
-        const TensorLayout& src, const CanonizedFilterMeta& filter,
-        const TensorLayout& dst, size_t workspace_limit_in_bytes,
-        const AlgoAttribute& positive_attr,
-        const AlgoAttribute& negative_attr) {
     AlgoBase::SizeArgs args(this, src, filter, dst);
 
 #if CUDNN_MAJOR < 7 || (CUDNN_MAJOR == 7 && CUDNN_MINOR < 5)
@@ -98,18 +88,14 @@ Convolution3DForwardImpl::get_algorithm_heuristic(
         if (auto algo = get_cudnn_algo())
             return algo;
     }
+
     if (args.filter_meta.group > 1) {
-        auto orig_args = args;
-        TensorLayout a, b;
-        AlgoGroupConvGeneral::modify_size_args(args, a, b);
-        if (prefer_1x1x1()) {
-            return sm_algo_pack.algo2gconv.at(&sm_algo_pack.a1x1x1);
-        }
-        if (is_cudnn_supported(args)) {
-            if (auto algo = get_cudnn_algo())
-                return sm_algo_pack.algo2gconv.at(algo);
+        if (auto algo =
+                    megdnn::get_algo_match_attribute<Convolution3DForwardImpl>(
+                            &sm_algo_pack.group, positive_attr,
+                            negative_attr)) {
+            return algo;
         }
-        args = orig_args;
     }
 
     return megdnn::get_algo_match_attribute<Convolution3DForwardImpl>(
@@ -129,7 +115,7 @@ size_t Convolution3DForwardImpl::get_workspace_in_bytes(
         const TensorLayout& src, const TensorLayout& filter,
         const TensorLayout& dst) {
     AlgoBase::SizeArgs args(this, src, filter, dst);
-    return get_algorithm(this, src, args.filter_meta, dst)
+    return get_algorithm(this, src, filter, dst)
             ->get_workspace_in_bytes(args);
 }
 
@@ -138,7 +124,7 @@ void Convolution3DForwardImpl::exec(_megdnn_tensor_in src,
                                     _megdnn_tensor_out dst,
                                     _megdnn_workspace workspace) {
     AlgoBase::ExecArgs args(this, src, filter, dst, workspace);
-    auto algo = get_algorithm(this, src.layout, args.filter_meta, dst.layout);
+    auto algo = get_algorithm(this, src.layout, filter.layout, dst.layout);
     algo->check_workspace(args, workspace).exec(args);
 }
 
@@ -151,7 +137,7 @@ void Convolution3DBackwardDataImpl::exec(_megdnn_tensor_in filter,
                                          _megdnn_tensor_out grad,
                                          _megdnn_workspace workspace) {
     AlgoBase::ExecArgs args(this, filter, diff, grad, workspace);
-    auto algo = get_algorithm(this, args.filter_meta, diff.layout, grad.layout);
+    auto algo = get_algorithm(this, filter.layout, diff.layout, grad.layout);
     algo->check_workspace(args, workspace).exec(args);
 }
 
@@ -169,17 +155,6 @@ Convolution3DBackwardDataImpl::get_algorithm_heuristic(
         const TensorLayout& grad, size_t workspace_limit_in_bytes,
         const AlgoAttribute& positive_attr,
         const AlgoAttribute& negative_attr) {
-    auto fm = check_layout_fwd(grad, filter, diff);
-    return get_algorithm_heuristic(fm, diff, grad, workspace_limit_in_bytes,
-                                   positive_attr, negative_attr);
-}
-
-Convolution3DBackwardDataImpl::Algorithm*
-Convolution3DBackwardDataImpl::get_algorithm_heuristic(
-        const CanonizedFilterMeta& filter, const TensorLayout& diff,
-        const TensorLayout& grad, size_t workspace_limit_in_bytes,
-        const AlgoAttribute& positive_attr,
-        const AlgoAttribute& negative_attr) {
     AlgoBase::SizeArgs args(this, filter, diff, grad);
 
     if (args.filter_meta.group > 1 &&
@@ -215,14 +190,11 @@ Convolution3DBackwardDataImpl::get_algorithm_heuristic(
     }
 
     if (args.filter_meta.group > 1) {
-        auto orig_args = args;
-        TensorLayout a, b;
-        AlgoGroupConvGeneral::modify_size_args(args, a, b);
-        if (is_cudnn_supported(args.as_fwd_args())) {
-            if (auto algo = get_cudnn_algo())
-                return sm_algo_pack.algo2gconv.at(algo);
+        if (auto algo = megdnn::get_algo_match_attribute<
+                    Convolution3DBackwardDataImpl>(
+                    &sm_algo_pack.group, positive_attr, negative_attr)) {
+            return algo;
         }
-        args = orig_args;
     }
 
     return megdnn::get_algo_match_attribute<Convolution3DBackwardDataImpl>(
@@ -234,7 +206,7 @@ size_t Convolution3DBackwardDataImpl::get_workspace_in_bytes(
         const TensorLayout& filter, const TensorLayout& diff,
         const TensorLayout& grad) {
     AlgoBase::SizeArgs args(this, filter, diff, grad);
-    return get_algorithm(this, args.filter_meta, diff, grad)
+    return get_algorithm(this, filter, diff, grad)
             ->get_workspace_in_bytes(args);
 }
 
@@ -248,7 +220,7 @@ void Convolution3DBackwardFilterImpl::exec(_megdnn_tensor_in src,
                                            _megdnn_workspace workspace) {
     AlgoBase::ExecArgs args(this, src, diff, grad, workspace);
     auto algo =
-            get_algorithm(this, src.layout, diff.layout, args.grad_filter_meta);
+            get_algorithm(this, src.layout, diff.layout, grad.layout);
     algo->check_workspace(args, workspace).exec(args);
 }
 
@@ -266,17 +238,6 @@ Convolution3DBackwardFilterImpl::get_algorithm_heuristic(
         const TensorLayout& grad, size_t workspace_limit_in_bytes,
         const AlgoAttribute& positive_attr,
         const AlgoAttribute& negative_attr) {
-    auto fm = check_layout_fwd(src, grad, diff);
-    return get_algorithm_heuristic(src, diff, fm, workspace_limit_in_bytes,
-                                   positive_attr, negative_attr);
-}
-
-Convolution3DBackwardFilterImpl::Algorithm*
-Convolution3DBackwardFilterImpl::get_algorithm_heuristic(
-        const TensorLayout& src, const TensorLayout& diff,
-        const CanonizedFilterMeta& grad, size_t workspace_limit_in_bytes,
-        const AlgoAttribute& positive_attr,
-        const AlgoAttribute& negative_attr) {
     AlgoBase::SizeArgs args(this, src, diff, grad);
 
     if (args.grad_filter_meta.group > 1 &&
@@ -310,15 +271,13 @@ Convolution3DBackwardFilterImpl::get_algorithm_heuristic(
         if (auto algo = get_cudnn_algo())
             return algo;
     }
+
     if (args.grad_filter_meta.group > 1) {
-        auto orig_args = args;
-        TensorLayout a, b;
-        AlgoGroupConvGeneral::modify_size_args(args, a, b);
-        if (is_cudnn_supported(args.as_fwd_args())) {
-            if (auto algo = get_cudnn_algo())
-                return sm_algo_pack.algo2gconv.at(algo);
+        if (auto algo = megdnn::get_algo_match_attribute<
+                    Convolution3DBackwardFilterImpl>(
+                    &sm_algo_pack.group, positive_attr, negative_attr)) {
+            return algo;
         }
-        args = orig_args;
     }
 
     return megdnn::get_algo_match_attribute<Convolution3DBackwardFilterImpl>(
@@ -330,7 +289,7 @@ size_t Convolution3DBackwardFilterImpl::get_workspace_in_bytes(
         const TensorLayout& src, const TensorLayout& diff,
         const TensorLayout& grad) {
     AlgoBase::SizeArgs args(this, src, diff, grad);
-    return get_algorithm(this, src, diff, args.grad_filter_meta)
+    return get_algorithm(this, src, diff, grad)
             ->get_workspace_in_bytes(args);
 }
 
diff --git a/dnn/src/cuda/convolution3d/opr_impl.h b/dnn/src/cuda/convolution3d/opr_impl.h
index 815e7b2cf1ae3c071bca5bf0edf3c3000d64d47a..f240ae5d74793bb07d69e3fbf2ba30c3cfb92066 100644
--- a/dnn/src/cuda/convolution3d/opr_impl.h
+++ b/dnn/src/cuda/convolution3d/opr_impl.h
@@ -21,17 +21,6 @@ public:
     using Convolution3DForward::Convolution3DForward;
     void exec(_megdnn_tensor_in src, _megdnn_tensor_in filter,
               _megdnn_tensor_out dst, _megdnn_workspace workspace) override;
-    AlgorithmInfo get_algorithm_info_heuristic(const TensorLayout& src,
-                                       const CanonizedFilterMeta& filter,
-                                       const TensorLayout& dst,
-                                       size_t workspace_limit_in_bytes,
-                                       const AlgoAttribute& positive_attr,
-                                       const AlgoAttribute& negative_attr) {
-        return get_algorithm_heuristic(src, filter, dst,
-                                       workspace_limit_in_bytes, positive_attr,
-                                       negative_attr)
-                ->info();
-    }
     size_t get_workspace_in_bytes(const TensorLayout& src,
                                   const TensorLayout& filter,
                                   const TensorLayout& dst) override;
@@ -57,13 +46,6 @@ protected:
             const AlgoAttribute& negative_attr) override;
 
 private:
-    Algorithm* get_algorithm_heuristic(const TensorLayout& src,
-                                       const CanonizedFilterMeta& filter,
-                                       const TensorLayout& dst,
-                                       size_t workspace_limit_in_bytes,
-                                       const AlgoAttribute& positive_attr,
-                                       const AlgoAttribute& negative_attr);
-
     static AlgoPack sm_algo_pack;
 };
 
@@ -72,16 +54,6 @@ public:
     using Convolution3DBackwardData::Convolution3DBackwardData;
     void exec(_megdnn_tensor_in filter, _megdnn_tensor_in diff,
               _megdnn_tensor_out grad, _megdnn_workspace workspace) override;
-    AlgorithmInfo get_algorithm_info_heuristic(
-            const CanonizedFilterMeta& filter, const TensorLayout& diff,
-            const TensorLayout& grad, size_t workspace_limit_in_bytes,
-            const AlgoAttribute& positive_attr,
-            const AlgoAttribute& negative_attr) {
-        return get_algorithm_heuristic(filter, diff, grad,
-                                       workspace_limit_in_bytes, positive_attr,
-                                       negative_attr)
-                ->info();
-    }
     size_t get_workspace_in_bytes(const TensorLayout& filter,
                                   const TensorLayout& diff,
                                   const TensorLayout& grad) override;
@@ -109,13 +81,6 @@ protected:
             const AlgoAttribute& negative_attr) override;
 
 private:
-    Algorithm* get_algorithm_heuristic(const CanonizedFilterMeta& filter,
-                                       const TensorLayout& diff,
-                                       const TensorLayout& grad,
-                                       size_t workspace_limit_in_bytes,
-                                       const AlgoAttribute& positive_attr,
-                                       const AlgoAttribute& negative_attr);
-
     static AlgoPack sm_algo_pack;
 };
 
@@ -127,17 +92,6 @@ public:
     size_t get_workspace_in_bytes(const TensorLayout& src,
                                   const TensorLayout& diff,
                                   const TensorLayout& grad) override;
-    AlgorithmInfo get_algorithm_info_heuristic(
-            const TensorLayout& src, const TensorLayout& diff,
-            const CanonizedFilterMeta& grad, size_t workspace_limit_in_bytes,
-            const AlgoAttribute& positive_attr,
-            const AlgoAttribute& negative_attr) {
-        return get_algorithm_heuristic(src, diff, grad,
-                                       workspace_limit_in_bytes, positive_attr,
-                                       negative_attr)
-                ->info();
-    }
-
     const char* get_algorithm_set_name() const override;
 
     class AlgoBase;
@@ -162,13 +116,6 @@ protected:
             const AlgoAttribute& negative_attr) override;
 
 private:
-    Algorithm* get_algorithm_heuristic(const TensorLayout& src,
-                                       const TensorLayout& diff,
-                                       const CanonizedFilterMeta& grad,
-                                       size_t workspace_limit_in_bytes,
-                                       const AlgoAttribute& positive_attr,
-                                       const AlgoAttribute& negative_attr);
-
     static AlgoPack sm_algo_pack;
 };
 }  // namespace cuda
diff --git a/dnn/test/cuda/group_conv3d.cpp b/dnn/test/cuda/group_conv3d.cpp
index 402d0f61463495afdc94b93ffe225631cfd37477..611293c425e37264617e009cd8a79d3e0d59058e 100644
--- a/dnn/test/cuda/group_conv3d.cpp
+++ b/dnn/test/cuda/group_conv3d.cpp
@@ -66,12 +66,10 @@ TEST_F(CUDA, GROUP_CONVOLUTION3D_FORWARD_1x1x1) {
     auto run = [&](size_t N, size_t IC, size_t ID, size_t IH, size_t IW,
                    size_t FD, size_t FH, size_t FW, size_t OC, size_t group) {
         Checker<Convolution3D> checker(handle_cuda());
-#if CUDNN_MAJOR <= 6
-        bool require_algo = true;
-        checker.set_before_exec_callback(
-                AlgoChecker<Convolution3DForward>{
-                        "group_conv3d:1x1x1", &require_algo});
-#endif
+        checker.set_before_exec_callback(AlgoChecker<Convolution3DForward>(
+                ExecutionPolicyAlgoName{"CUDA:GROUP_CONV3D_FORWARD",
+                                        {{"1x1x1",
+                                          {}}}}));
         Convolution3D::Param param;
         param.sparse = Convolution3D::Param::Sparse::GROUP;
         auto ICg = IC / group;
@@ -125,6 +123,45 @@ TEST_F(CUDA, GROUP_CONVOLUTION3D_BACKWARD_DATA) {
     run(2, 32, 64, 64, 64, 3, 3, 3, 32, 62, 62, 62, 0, 0, 0, 1, 1, 1, 4);
 }
 
+TEST_F(CUDA, GROUP_CONVOLUTION3D_BACKWARD_DATA_CUDNN) {
+    auto run = [&](size_t N, size_t IC, size_t ID, size_t IH, size_t IW,
+                   size_t FD, size_t FH, size_t FW, size_t OC, size_t OD,
+                   size_t OH, size_t OW, size_t PD, size_t PH, size_t PW,
+                   size_t SD, size_t SH, size_t SW, size_t group) {
+        Checker<Convolution3DBackwardData> checker(handle_cuda());
+        checker.set_before_exec_callback(
+                AlgoChecker<Convolution3DBackwardData>(ExecutionPolicyAlgoName{
+                        "CUDA:GROUP_CONV3D_BACKWARD_DATA", {{"CUDNN", {}}}}));
+        Convolution3DBackwardData::Param param;
+        param.sparse = Convolution3D::Param::Sparse::GROUP;
+        param.pad_d = PD;
+        param.pad_h = PH;
+        param.pad_w = PW;
+        param.stride_d = SD;
+        param.stride_h = SH;
+        param.stride_w = SW;
+        auto ICg = IC / group;
+        auto OCg = OC / group;
+        checker.set_param(param).exec({{group, OCg, ICg, FD, FH, FW},
+                                       {N, OC, OD, OH, OW},
+                                       {N, IC, ID, IH, IW}});
+    };
+    // bug case in prev ver
+
+    run(1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 3, 0, 0, 1, 1, 1, 1, 2);
+    run(1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 0, 0, 1, 1, 1, 2, 2);
+    run(1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 0, 1, 0, 1, 2, 1, 2);
+    run(1, 2, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 0, 0, 2, 1, 1, 2);
+    // normal case
+    run(2, 64, 7, 7, 7, 3, 3, 3, 32, 5, 5, 5, 0, 0, 0, 1, 1, 1, 2);
+    // padded case
+    run(2, 32, 7, 7, 7, 3, 3, 3, 64, 7, 7, 7, 1, 1, 1, 1, 1, 1, 4);
+    // strided case
+    run(2, 32, 7, 7, 7, 3, 3, 3, 64, 3, 3, 3, 0, 0, 0, 2, 2, 2, 8);
+    // bigger case
+    run(2, 32, 64, 64, 64, 3, 3, 3, 32, 62, 62, 62, 0, 0, 0, 1, 1, 1, 4);
+}
+
 TEST_F(CUDA, GROUP_CONVOLUTION3D_BACKWARD_FILTER) {
     auto run = [&](size_t N, size_t IC, size_t ID, size_t IH, size_t IW,
                    size_t FD, size_t FH, size_t FW, size_t OC, size_t OD,
@@ -153,6 +190,39 @@ TEST_F(CUDA, GROUP_CONVOLUTION3D_BACKWARD_FILTER) {
     run(2, 32, 7, 7, 7, 3, 3, 3, 64, 3, 3, 3, 0, 0, 0, 2, 2, 2, 8);
 }
 
+TEST_F(CUDA, GROUP_CONVOLUTION3D_BACKWARD_FILTER_CUDNN) {
+    auto run = [&](size_t N, size_t IC, size_t ID, size_t IH, size_t IW,
+                   size_t FD, size_t FH, size_t FW, size_t OC, size_t OD,
+                   size_t OH, size_t OW, size_t PD, size_t PH, size_t PW,
+                   size_t SD, size_t SH, size_t SW, size_t group) {
+        Checker<Convolution3DBackwardFilter> checker(handle_cuda());
+        checker.set_before_exec_callback(
+                AlgoChecker<Convolution3DBackwardFilter>(
+                        ExecutionPolicyAlgoName{
+                                "CUDA:GROUP_CONV3D_BACKWARD_FILTER",
+                                {{"CUDNN", {}}}}));
+        Convolution3DBackwardFilter::Param param;
+        param.sparse = Convolution3D::Param::Sparse::GROUP;
+        param.pad_d = PD;
+        param.pad_h = PH;
+        param.pad_w = PW;
+        param.stride_d = SD;
+        param.stride_h = SH;
+        param.stride_w = SW;
+        auto ICg = IC / group;
+        auto OCg = OC / group;
+        checker.set_param(param).exec({{N, IC, ID, IH, IW},
+                                       {N, OC, OD, OH, OW},
+                                       {group, OCg, ICg, FD, FH, FW}});
+    };
+    // normal case
+    run(2, 64, 7, 7, 7, 3, 3, 3, 32, 5, 5, 5, 0, 0, 0, 1, 1, 1, 2);
+    // padded case
+    run(2, 32, 7, 7, 7, 3, 3, 3, 64, 7, 7, 7, 1, 1, 1, 1, 1, 1, 4);
+    // strided case
+    run(2, 32, 7, 7, 7, 3, 3, 3, 64, 3, 3, 3, 0, 0, 0, 2, 2, 2, 8);
+}
+
 }  // namespace test
 }  // namespace megdnn