diff --git a/dnn/src/fallback/conv_bias/conv1x1/algos.cpp b/dnn/src/fallback/conv_bias/conv1x1/algos.cpp
index 28435abbdbe91494529bd50a7190c425b3916a4e..611d7d68c56f6b626669eebd3201a2ec4c4127a7 100644
--- a/dnn/src/fallback/conv_bias/conv1x1/algos.cpp
+++ b/dnn/src/fallback/conv_bias/conv1x1/algos.cpp
@@ -201,24 +201,27 @@ bool ConvBiasImpl::AlgoConv1x1::usable(ConvBiasImpl* opr,
         if (FH != 1 || FW != 1 || PH || PW || SH != 1 || SW != 1)
             return false;
 
+        if (param.src_type.enumv() != param.filter_type.enumv() &&
+            param.src_type.enumv() != DTypeEnum::Int8 &&
+            param.src_type.enumv() != DTypeEnum::QuantizedS8 &&
+            param.src_type.enumv() != DTypeEnum::Quantized8Asymm &&
+#if !MEGDNN_DISABLE_FLOAT16
+            param.src_type.enumv() != DTypeEnum::Float16 &&
+#endif
+            param.src_type.enumv() != DTypeEnum::Float32) {
+            return false;
+        }
         //! make sure 8x8x16 and 8x8x32 biasmode is nobias and nonlineMode
         //! is identity otherwise return false mean that 8x8x32 and 8x8x16
         //! not support PostProcess
-        if (param.src_type.enumv() == param.filter_type.enumv() &&
-            (param.src_type.enumv() == DTypeEnum::Int8 &&
-             (param.dst_type.enumv() == DTypeEnum::Int16 ||
-              param.dst_type.enumv() == DTypeEnum::Int32)) &&
-            param.bias_mode != megdnn::BiasMode::NO_BIAS &&
-            param.nonlineMode != megdnn::NonlineMode::IDENTITY)
-            return false;
-
-        if (param.src_type.enumv() == param.filter_type.enumv() &&
-            ((param.src_type.enumv() == DTypeEnum::QuantizedS8 ||
-              param.src_type.enumv() == DTypeEnum::Quantized8Asymm) &&
-             param.dst_type.enumv() == DTypeEnum::QuantizedS32) &&
-            param.bias_mode != megdnn::BiasMode::NO_BIAS &&
-            param.nonlineMode != megdnn::NonlineMode::IDENTITY)
-            return false;
+        if (param.dst_type.enumv() == DTypeEnum::Int16 ||
+            param.dst_type.enumv() == DTypeEnum::Int32 ||
+            param.dst_type.enumv() == DTypeEnum::QuantizedS32) {
+            if (param.bias_mode != megdnn::BiasMode::NO_BIAS ||
+                param.nonlineMode != megdnn::NonlineMode::IDENTITY) {
+                return false;
+            }
+        }
 
         if (opr->param().format == param::ConvBias::Format::NCHW44 ||
             opr->param().format == param::ConvBias::Format::NCHW44_DOT) {
diff --git a/dnn/src/fallback/conv_bias/im2col/algos.cpp b/dnn/src/fallback/conv_bias/im2col/algos.cpp
index 5507f51a0e2ea6c35d2ce208ef4c58da432125e5..9d4e89e7011a81eff94cada12150d07ebe43b469 100644
--- a/dnn/src/fallback/conv_bias/im2col/algos.cpp
+++ b/dnn/src/fallback/conv_bias/im2col/algos.cpp
@@ -647,19 +647,26 @@ bool ConvBiasImpl::AlgoIm2col::usable(
             return false;
         }
 
+        if (param.src_type.enumv() != param.filter_type.enumv() &&
+            param.src_type.enumv() != DTypeEnum::Int8 &&
+            param.src_type.enumv() != DTypeEnum::QuantizedS8 &&
+            param.src_type.enumv() != DTypeEnum::Quantized8Asymm &&
+#if !MEGDNN_DISABLE_FLOAT16
+            param.src_type.enumv() != DTypeEnum::Float16 &&
+#endif
+            param.src_type.enumv() != DTypeEnum::Float32) {
+            return false;
+        }
         //! make sure 8x8x16 and 8x8x32 biasmode is  nobias and nonlineMode is
         //! identity otherwise return false mean that 8x8x32 and 8x8x16 not
         //! support PostProcess
-        if (param.src_type.enumv() == param.filter_type.enumv() &&
-            ((param.src_type.enumv() == DTypeEnum::Int8 &&
-              (param.dst_type.enumv() == DTypeEnum::Int16 ||
-               param.dst_type.enumv() == DTypeEnum::Int32)) ||
-             ((param.src_type.enumv() == DTypeEnum::QuantizedS8 ||
-               param.src_type.enumv() == DTypeEnum::Quantized8Asymm) &&
-              param.dst_type.enumv() == DTypeEnum::QuantizedS32)) &&
-            param.bias_mode != megdnn::BiasMode::NO_BIAS &&
-            param.nonlineMode != megdnn::NonlineMode::IDENTITY) {
-            return false;
+        if (param.dst_type.enumv() == DTypeEnum::Int16 ||
+            param.dst_type.enumv() == DTypeEnum::Int32 ||
+            param.dst_type.enumv() == DTypeEnum::QuantizedS32) {
+            if (param.bias_mode != megdnn::BiasMode::NO_BIAS ||
+                param.nonlineMode != megdnn::NonlineMode::IDENTITY) {
+                return false;
+            }
         }
         if (opr->param().format == param::ConvBias::Format::NCHW44 ||
             opr->param().format == param::ConvBias::Format::NCHW44_DOT) {
diff --git a/dnn/test/fallback/conv_bias.cpp b/dnn/test/fallback/conv_bias.cpp
index 3fc82d1241c4f43b2ebd97c6ae91876ffc724d8c..d00719f074fd4e4c273e68ac40558d5a84593799 100644
--- a/dnn/test/fallback/conv_bias.cpp
+++ b/dnn/test/fallback/conv_bias.cpp
@@ -188,6 +188,24 @@ void checker_conv_bias(std::vector<conv_bias::TestArg> args, Handle* handle,
     }
 }
 
+TEST_F(FALLBACK_MULTI_THREADS, CONV_BIAS_FORWARD_IM2COL_8X8X16) {
+    using namespace conv_bias;
+    param::ConvBias cur_param;
+    using NLMode = param::ConvBias::NonlineMode;
+    std::vector<conv_bias::TestArg> args = get_conv_bias_args(
+            {1, 3}, {0}, {NLMode::IDENTITY, NLMode::RELU}, {1}, false, true);
+    NormalRNG default_rng;
+    Checker<ConvBias> checker(handle());
+    checker.set_dtype(0, dtype::Int8{});
+    checker.set_dtype(1, dtype::Int8{});
+    checker.set_dtype(2, dtype::Int16{});
+    checker.set_dtype(4, dtype::Int16{});
+    for (auto&& arg : args) {
+        checker.set_param(arg.param).execs(
+                {arg.src, arg.filter, arg.bias, {}, {}});
+    }
+}
+
 TEST_F(FALLBACK_MULTI_THREADS, CONV_BIAS_FORWARD) {
     using namespace conv_bias;
     param::ConvBias cur_param;
diff --git a/src/gopt/impl/inference.cpp b/src/gopt/impl/inference.cpp
index c43dd0d655f1b319747f50886a2ef1db6b5cc5ce..4d641942e915dcc509c88a37bd5b4f982aa17970 100644
--- a/src/gopt/impl/inference.cpp
+++ b/src/gopt/impl/inference.cpp
@@ -1671,7 +1671,9 @@ void FuseConvBiasNonlinPass::apply(OptState& state) const {
                 rewriter.get_var(typecvt->input(0))->owner_opr());
         if (!conv_bias || m_deps.count(typecvt->input(0)) != 1 ||
             typecvt->output(0)->dtype().enumv() !=
-                    DTypeTrait<dtype::QuantizedS8>::enumv)
+                    DTypeTrait<dtype::QuantizedS8>::enumv ||
+            typecvt->input(0)->dtype().enumv() !=
+                    DTypeTrait<dtype::QuantizedS32>::enumv)
             return nullptr;
 
         auto config = conv_bias->config();