diff --git a/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVF.cpp b/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVF.cpp
index 510ab46bd6de3bd0683a0a78cf433835a5c8144b..0c4856f2b64b844f94345de1a7d9c72d76c53b2c 100644
--- a/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVF.cpp
+++ b/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVF.cpp
@@ -115,6 +115,19 @@ IVF::Search(const DatasetPtr& dataset, const Config& config) {
 
     search_impl(rows, (float*)p_data, search_cfg->k, res_dis, res_ids, config);
 
+    //    std::stringstream ss_res_id, ss_res_dist;
+    //    for (int i = 0; i < 10; ++i) {
+    //        printf("%llu", res_ids[i]);
+    //        printf("\n");
+    //        printf("%.6f", res_dis[i]);
+    //        printf("\n");
+    //        ss_res_id << res_ids[i] << " ";
+    //        ss_res_dist << res_dis[i] << " ";
+    //    }
+    //    std::cout << std::endl << "after search: " << std::endl;
+    //    std::cout << ss_res_id.str() << std::endl;
+    //    std::cout << ss_res_dist.str() << std::endl << std::endl;
+
     auto id_buf = MakeMutableBufferSmart((uint8_t*)res_ids, sizeof(int64_t) * elems);
     auto dist_buf = MakeMutableBufferSmart((uint8_t*)res_dis, sizeof(float) * elems);
 
diff --git a/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVFSQHybrid.cpp b/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVFSQHybrid.cpp
index 5f916f3370a9afe9f81318252cc94253fbb93eb5..268b7fb9e329c62c6096e930579599b6a004e799 100644
--- a/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVFSQHybrid.cpp
+++ b/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVFSQHybrid.cpp
@@ -17,6 +17,7 @@
 // under the License.
 
 #include "knowhere/index/vector_index/IndexIVFSQHybrid.h"
+#include <utility>
 #include "faiss/AutoTune.h"
 #include "faiss/gpu/GpuAutoTune.h"
 #include "faiss/gpu/GpuIndexIVF.h"
@@ -79,20 +80,8 @@ IVFSQHybrid::CopyGpuToCpu(const Config& config) {
 VectorIndexPtr
 IVFSQHybrid::CopyCpuToGpu(const int64_t& device_id, const Config& config) {
     if (auto res = FaissGpuResourceMgr::GetInstance().GetRes(device_id)) {
-        ResScope rs(res, device_id, false);
-        faiss::gpu::GpuClonerOptions option;
-        option.allInGpu = true;
-
-        faiss::IndexComposition index_composition;
-        index_composition.index = index_.get();
-        index_composition.quantizer = nullptr;
-        index_composition.mode = 0;  // copy all
-
-        auto gpu_index = faiss::gpu::index_cpu_to_gpu(res->faiss_res.get(), device_id, &index_composition, &option);
-
-        std::shared_ptr<faiss::Index> device_index;
-        device_index.reset(gpu_index);
-        return std::make_shared<IVFSQHybrid>(device_index, device_id, res);
+        auto p = CopyCpuToGpuWithQuantizer(device_id, config);
+        return p.first;
     } else {
         KNOWHERE_THROW_MSG("CopyCpuToGpu Error, can't get gpu_resource");
     }
@@ -180,7 +169,7 @@ IVFSQHybrid::UnsetQuantizer() {
     ivf_index->quantizer = nullptr;
 }
 
-void
+VectorIndexPtr
 IVFSQHybrid::LoadData(const knowhere::QuantizerPtr& q, const Config& conf) {
     auto quantizer_conf = std::dynamic_pointer_cast<QuantizerCfg>(conf);
     if (quantizer_conf != nullptr) {
@@ -188,9 +177,10 @@ IVFSQHybrid::LoadData(const knowhere::QuantizerPtr& q, const Config& conf) {
             KNOWHERE_THROW_MSG("mode only support 2 in this func");
         }
     }
-    if (quantizer_conf->gpu_id != gpu_id_) {
-        KNOWHERE_THROW_MSG("quantizer and data must on the same gpu card");
-    }
+    //    if (quantizer_conf->gpu_id != gpu_id_) {
+    //        KNOWHERE_THROW_MSG("quantizer and data must on the same gpu card");
+    //    }
+    gpu_id_ = quantizer_conf->gpu_id;
 
     if (auto res = FaissGpuResourceMgr::GetInstance().GetRes(gpu_id_)) {
         ResScope rs(res, gpu_id_, false);
@@ -207,8 +197,37 @@ IVFSQHybrid::LoadData(const knowhere::QuantizerPtr& q, const Config& conf) {
         index_composition->mode = quantizer_conf->mode;  // only 2
 
         auto gpu_index = faiss::gpu::index_cpu_to_gpu(res->faiss_res.get(), gpu_id_, index_composition, &option);
-        index_.reset(gpu_index);
-        gpu_mode = 2;  // all in gpu
+        std::shared_ptr<faiss::Index> new_idx;
+        new_idx.reset(gpu_index);
+        auto sq_idx = std::make_shared<IVFSQHybrid>(new_idx, gpu_id_, res);
+        return sq_idx;
+    } else {
+        KNOWHERE_THROW_MSG("CopyCpuToGpu Error, can't get gpu_resource");
+    }
+}
+
+std::pair<VectorIndexPtr, QuantizerPtr>
+IVFSQHybrid::CopyCpuToGpuWithQuantizer(const int64_t& device_id, const Config& config) {
+    if (auto res = FaissGpuResourceMgr::GetInstance().GetRes(device_id)) {
+        ResScope rs(res, device_id, false);
+        faiss::gpu::GpuClonerOptions option;
+        option.allInGpu = true;
+
+        faiss::IndexComposition index_composition;
+        index_composition.index = index_.get();
+        index_composition.quantizer = nullptr;
+        index_composition.mode = 0;  // copy all
+
+        auto gpu_index = faiss::gpu::index_cpu_to_gpu(res->faiss_res.get(), device_id, &index_composition, &option);
+
+        std::shared_ptr<faiss::Index> device_index;
+        device_index.reset(gpu_index);
+        auto new_idx = std::make_shared<IVFSQHybrid>(device_index, device_id, res);
+
+        auto q = std::make_shared<FaissIVFQuantizer>();
+        q->quantizer = index_composition.quantizer;
+        q->size = index_composition.quantizer->d * index_composition.quantizer->getNumVecs() * sizeof(float);
+        return std::make_pair(new_idx, q);
     } else {
         KNOWHERE_THROW_MSG("CopyCpuToGpu Error, can't get gpu_resource");
     }
diff --git a/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVFSQHybrid.h b/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVFSQHybrid.h
index e2ca208d902b4314df5c0a6ef134efe383900b19..f54c61c20f69fcdc7758d8e22fc733aca7aedbd0 100644
--- a/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVFSQHybrid.h
+++ b/cpp/src/core/knowhere/knowhere/index/vector_index/IndexIVFSQHybrid.h
@@ -19,6 +19,7 @@
 
 #include <faiss/index_io.h>
 #include <memory>
+#include <utility>
 
 #include "IndexGPUIVFSQ.h"
 #include "Quantizer.h"
@@ -60,9 +61,12 @@ class IVFSQHybrid : public GPUIVFSQ {
     void
     UnsetQuantizer();
 
-    void
+    VectorIndexPtr
     LoadData(const knowhere::QuantizerPtr& q, const Config& conf);
 
+    std::pair<VectorIndexPtr, QuantizerPtr>
+    CopyCpuToGpuWithQuantizer(const int64_t& device_id, const Config& config);
+
     IndexModelPtr
     Train(const DatasetPtr& dataset, const Config& config) override;
 
diff --git a/cpp/src/core/unittest/test_ivf.cpp b/cpp/src/core/unittest/test_ivf.cpp
index 3c403f690c7f9229c28786f3c8647622207776ad..3b3e557c4d77637468f086b631b985ef3b8a8380 100644
--- a/cpp/src/core/unittest/test_ivf.cpp
+++ b/cpp/src/core/unittest/test_ivf.cpp
@@ -243,23 +243,23 @@ TEST_P(IVFTest, hybrid) {
         hybrid_1_idx->UnsetQuantizer();
     }
 
-    //    {
-    //        auto hybrid_2_idx = std::make_shared<knowhere::IVFSQHybrid>(device_id);
-    //
-    //        auto binaryset = index_->Serialize();
-    //        hybrid_2_idx->Load(binaryset);
-    //
-    //        auto quantizer_conf = std::make_shared<knowhere::QuantizerCfg>();
-    //        quantizer_conf->mode = 1;
-    //        quantizer_conf->gpu_id = device_id;
-    //        auto q = hybrid_2_idx->LoadQuantizer(quantizer_conf);
-    //        quantizer_conf->mode = 2;
-    //        hybrid_2_idx->LoadData(q, quantizer_conf);
-    //
-    //        auto result = hybrid_2_idx->Search(query_dataset, conf);
-    //        AssertAnns(result, nq, conf->k);
-    //        PrintResult(result, nq, k);
-    //    }
+    {
+        auto hybrid_2_idx = std::make_shared<knowhere::IVFSQHybrid>(device_id);
+
+        auto binaryset = index_->Serialize();
+        hybrid_2_idx->Load(binaryset);
+
+        auto quantizer_conf = std::make_shared<knowhere::QuantizerCfg>();
+        quantizer_conf->mode = 1;
+        quantizer_conf->gpu_id = device_id;
+        auto q = hybrid_2_idx->LoadQuantizer(quantizer_conf);
+        quantizer_conf->mode = 2;
+        auto gpu_idx = hybrid_2_idx->LoadData(q, quantizer_conf);
+
+        auto result = gpu_idx->Search(query_dataset, conf);
+        AssertAnns(result, nq, conf->k);
+        PrintResult(result, nq, k);
+    }
 }
 
 // TEST_P(IVFTest, gpu_to_cpu) {
diff --git a/cpp/src/db/engine/ExecutionEngine.h b/cpp/src/db/engine/ExecutionEngine.h
index d7de6f37261f0370ca6c47553ed0e6c18e8ec37b..2c4960e6ac12a1b6d46a9b34173b5b48e5b52503 100644
--- a/cpp/src/db/engine/ExecutionEngine.h
+++ b/cpp/src/db/engine/ExecutionEngine.h
@@ -65,7 +65,7 @@ class ExecutionEngine {
     Load(bool to_cache = true) = 0;
 
     virtual Status
-    CopyToGpu(uint64_t device_id) = 0;
+    CopyToGpu(uint64_t device_id, bool hybrid) = 0;
 
     virtual Status
     CopyToIndexFileToGpu(uint64_t device_id) = 0;
@@ -80,7 +80,8 @@ class ExecutionEngine {
     Merge(const std::string& location) = 0;
 
     virtual Status
-    Search(int64_t n, const float* data, int64_t k, int64_t nprobe, float* distances, int64_t* labels) const = 0;
+    Search(int64_t n, const float* data, int64_t k, int64_t nprobe, float* distances, int64_t* labels,
+           bool hybrid) const = 0;
 
     virtual std::shared_ptr<ExecutionEngine>
     BuildIndex(const std::string& location, EngineType engine_type) = 0;
diff --git a/cpp/src/db/engine/ExecutionEngineImpl.cpp b/cpp/src/db/engine/ExecutionEngineImpl.cpp
index c5a36db07f1a124a12e189cf5884577e370fa74a..3fa68aae520dd81e79db016e031fb48bd5a6931a 100644
--- a/cpp/src/db/engine/ExecutionEngineImpl.cpp
+++ b/cpp/src/db/engine/ExecutionEngineImpl.cpp
@@ -31,6 +31,7 @@
 #include "wrapper/ConfAdapter.h"
 #include "wrapper/ConfAdapterMgr.h"
 
+#include <src/core/knowhere/knowhere/index/vector_index/IndexIVFSQHybrid.h>
 #include <src/scheduler/Utils.h>
 #include <stdexcept>
 #include <utility>
@@ -245,7 +246,31 @@ ExecutionEngineImpl::Load(bool to_cache) {
 }
 
 Status
-ExecutionEngineImpl::CopyToGpu(uint64_t device_id) {
+ExecutionEngineImpl::CopyToGpu(uint64_t device_id, bool hybrid) {
+    if (hybrid) {
+        auto key = location_ + ".quantizer";
+        auto quantizer =
+            std::static_pointer_cast<CachedQuantizer>(cache::GpuCacheMgr::GetInstance(device_id)->GetIndex(key));
+
+        auto conf = std::make_shared<knowhere::QuantizerCfg>();
+        conf->gpu_id = device_id;
+
+        if (quantizer) {
+            // cache hit
+            conf->mode = 2;
+            auto new_index = index_->LoadData(quantizer->Data(), conf);
+            index_ = new_index;
+        } else {
+            auto pair = index_->CopyToGpuWithQuantizer(device_id);
+            index_ = pair.first;
+
+            // cache
+            auto cached_quantizer = std::make_shared<CachedQuantizer>(pair.second);
+            cache::GpuCacheMgr::GetInstance(device_id)->InsertItem(key, cached_quantizer);
+        }
+        return Status::OK();
+    }
+
     auto index = std::static_pointer_cast<VecIndex>(cache::GpuCacheMgr::GetInstance(device_id)->GetIndex(location_));
     bool already_in_cache = (index != nullptr);
     if (already_in_cache) {
@@ -389,8 +414,8 @@ ExecutionEngineImpl::BuildIndex(const std::string& location, EngineType engine_t
 }
 
 Status
-ExecutionEngineImpl::Search(int64_t n, const float* data, int64_t k, int64_t nprobe, float* distances,
-                            int64_t* labels) const {
+ExecutionEngineImpl::Search(int64_t n, const float* data, int64_t k, int64_t nprobe, float* distances, int64_t* labels,
+                            bool hybrid) const {
     if (index_ == nullptr) {
         ENGINE_LOG_ERROR << "ExecutionEngineImpl: index is null, failed to search";
         return Status(DB_ERROR, "index is null");
@@ -406,11 +431,15 @@ ExecutionEngineImpl::Search(int64_t n, const float* data, int64_t k, int64_t npr
     auto adapter = AdapterMgr::GetInstance().GetAdapter(index_->GetType());
     auto conf = adapter->MatchSearch(temp_conf, index_->GetType());
 
-    HybridLoad();
+    if (hybrid) {
+        HybridLoad();
+    }
 
     auto status = index_->Search(n, data, distances, labels, conf);
 
-    HybridUnset();
+    if (hybrid) {
+        HybridUnset();
+    }
 
     if (!status.ok()) {
         ENGINE_LOG_ERROR << "Search error";
diff --git a/cpp/src/db/engine/ExecutionEngineImpl.h b/cpp/src/db/engine/ExecutionEngineImpl.h
index 4594986bd9bbd011ff2698b0fee195fea3eac66d..9cbabb2bd53ee5f67f84cca651422b0defda89a4 100644
--- a/cpp/src/db/engine/ExecutionEngineImpl.h
+++ b/cpp/src/db/engine/ExecutionEngineImpl.h
@@ -56,7 +56,7 @@ class ExecutionEngineImpl : public ExecutionEngine {
     Load(bool to_cache) override;
 
     Status
-    CopyToGpu(uint64_t device_id) override;
+    CopyToGpu(uint64_t device_id, bool hybrid = false) override;
 
     Status
     CopyToIndexFileToGpu(uint64_t device_id) override;
@@ -71,7 +71,8 @@ class ExecutionEngineImpl : public ExecutionEngine {
     Merge(const std::string& location) override;
 
     Status
-    Search(int64_t n, const float* data, int64_t k, int64_t nprobe, float* distances, int64_t* labels) const override;
+    Search(int64_t n, const float* data, int64_t k, int64_t nprobe, float* distances, int64_t* labels,
+           bool hybrid = false) const override;
 
     ExecutionEnginePtr
     BuildIndex(const std::string& location, EngineType engine_type) override;
diff --git a/cpp/src/scheduler/JobMgr.cpp b/cpp/src/scheduler/JobMgr.cpp
index 170dee4b80a02f8524d3fb8bfb0e4a46ad7dd1c8..70f1352a5cabc4392e21161274b0c4874a3e22b9 100644
--- a/cpp/src/scheduler/JobMgr.cpp
+++ b/cpp/src/scheduler/JobMgr.cpp
@@ -19,9 +19,11 @@
 #include "SchedInst.h"
 #include "TaskCreator.h"
 #include "optimizer/Optimizer.h"
+#include "scheduler/Algorithm.h"
+#include "scheduler/optimizer/Optimizer.h"
+#include "scheduler/tasklabel/SpecResLabel.h"
 #include "task/Task.h"
 
-#include <src/scheduler/optimizer/Optimizer.h>
 #include <utility>
 
 namespace milvus {
@@ -73,6 +75,10 @@ JobMgr::worker_function() {
             OptimizerInst::GetInstance()->Run(task);
         }
 
+        for (auto& task : tasks) {
+            calculate_path(task);
+        }
+
         // disk resources NEVER be empty.
         if (auto disk = res_mgr_->GetDiskResources()[0].lock()) {
             for (auto& task : tasks) {
@@ -87,5 +93,23 @@ JobMgr::build_task(const JobPtr& job) {
     return TaskCreator::Create(job);
 }
 
+void
+JobMgr::calculate_path(const TaskPtr& task) {
+    if (task->type_ != TaskType::SearchTask) {
+        return;
+    }
+
+    if (task->label()->Type() != TaskLabelType::SPECIFIED_RESOURCE) {
+        return;
+    }
+
+    std::vector<std::string> path;
+    auto spec_label = std::static_pointer_cast<SpecResLabel>(task->label());
+    auto src = res_mgr_->GetDiskResources()[0];
+    auto dest = spec_label->resource();
+    ShortestPath(src.lock(), dest.lock(), res_mgr_, path);
+    task->path() = Path(path, path.size() - 1);
+}
+
 }  // namespace scheduler
 }  // namespace milvus
diff --git a/cpp/src/scheduler/JobMgr.h b/cpp/src/scheduler/JobMgr.h
index 4340c9e616a6a353913cfcf8596f71c7ed969da0..b4c706d359bb50e3e53928df448435559e4e0816 100644
--- a/cpp/src/scheduler/JobMgr.h
+++ b/cpp/src/scheduler/JobMgr.h
@@ -52,9 +52,12 @@ class JobMgr {
     void
     worker_function();
 
-    std::vector<TaskPtr>
+    static std::vector<TaskPtr>
     build_task(const JobPtr& job);
 
+    void
+    calculate_path(const TaskPtr& task);
+
  private:
     bool running_ = false;
     std::queue<JobPtr> queue_;
diff --git a/cpp/src/scheduler/SchedInst.h b/cpp/src/scheduler/SchedInst.h
index 0d2a04b02c09960a8a13b5a478f73508ec9acd24..6500c781b01607bc6c432361fbb7052410ce34de 100644
--- a/cpp/src/scheduler/SchedInst.h
+++ b/cpp/src/scheduler/SchedInst.h
@@ -21,6 +21,7 @@
 #include "ResourceMgr.h"
 #include "Scheduler.h"
 #include "optimizer/HybridPass.h"
+#include "optimizer/LargeSQ8HPass.h"
 #include "optimizer/Optimizer.h"
 
 #include <memory>
@@ -91,9 +92,9 @@ class OptimizerInst {
         if (instance == nullptr) {
             std::lock_guard<std::mutex> lock(mutex_);
             if (instance == nullptr) {
-                HybridPassPtr pass_ptr = std::make_shared<HybridPass>();
                 std::vector<PassPtr> pass_list;
-                pass_list.push_back(pass_ptr);
+                pass_list.push_back(std::make_shared<LargeSQ8HPass>());
+                pass_list.push_back(std::make_shared<HybridPass>());
                 instance = std::make_shared<Optimizer>(pass_list);
             }
         }
diff --git a/cpp/src/scheduler/action/PushTaskToNeighbour.cpp b/cpp/src/scheduler/action/PushTaskToNeighbour.cpp
index 95f8212297dd56e042a5fae4631a0177912e3ae6..b42234d0f6f9f36f20c8eb29d0de39fa10f687b5 100644
--- a/cpp/src/scheduler/action/PushTaskToNeighbour.cpp
+++ b/cpp/src/scheduler/action/PushTaskToNeighbour.cpp
@@ -145,37 +145,39 @@ Action::SpecifiedResourceLabelTaskScheduler(ResourceMgrWPtr res_mgr, ResourcePtr
             transport_costs.push_back(transport_cost);
             paths.emplace_back(path);
         }
-        if (task->job_.lock()->type() == JobType::SEARCH) {
-            auto label = task->label();
-            auto spec_label = std::static_pointer_cast<SpecResLabel>(label);
-            if (spec_label->resource().lock()->type() == ResourceType::CPU) {
-                std::vector<std::string> spec_path;
-                spec_path.push_back(spec_label->resource().lock()->name());
-                spec_path.push_back(resource->name());
-                task->path() = Path(spec_path, spec_path.size() - 1);
-            } else {
-                // step 2: select min cost, cost(resource) = avg_cost * task_to_do + transport_cost
-                uint64_t min_cost = std::numeric_limits<uint64_t>::max();
-                uint64_t min_cost_idx = 0;
-                for (uint64_t i = 0; i < compute_resources.size(); ++i) {
-                    if (compute_resources[i]->TotalTasks() == 0) {
-                        min_cost_idx = i;
-                        break;
-                    }
-                    uint64_t cost = compute_resources[i]->TaskAvgCost() * compute_resources[i]->NumOfTaskToExec() +
-                                    transport_costs[i];
-                    if (min_cost > cost) {
-                        min_cost = cost;
-                        min_cost_idx = i;
-                    }
-                }
-
-                // step 3: set path in task
-                Path task_path(paths[min_cost_idx], paths[min_cost_idx].size() - 1);
-                task->path() = task_path;
-            }
-
-        } else if (task->job_.lock()->type() == JobType::BUILD) {
+        //        if (task->job_.lock()->type() == JobType::SEARCH) {
+        //            auto label = task->label();
+        //            auto spec_label = std::static_pointer_cast<SpecResLabel>(label);
+        //            if (spec_label->resource().lock()->type() == ResourceType::CPU) {
+        //                std::vector<std::string> spec_path;
+        //                spec_path.push_back(spec_label->resource().lock()->name());
+        //                spec_path.push_back(resource->name());
+        //                task->path() = Path(spec_path, spec_path.size() - 1);
+        //            } else {
+        //                // step 2: select min cost, cost(resource) = avg_cost * task_to_do + transport_cost
+        //                uint64_t min_cost = std::numeric_limits<uint64_t>::max();
+        //                uint64_t min_cost_idx = 0;
+        //                for (uint64_t i = 0; i < compute_resources.size(); ++i) {
+        //                    if (compute_resources[i]->TotalTasks() == 0) {
+        //                        min_cost_idx = i;
+        //                        break;
+        //                    }
+        //                    uint64_t cost = compute_resources[i]->TaskAvgCost() *
+        //                    compute_resources[i]->NumOfTaskToExec() +
+        //                                    transport_costs[i];
+        //                    if (min_cost > cost) {
+        //                        min_cost = cost;
+        //                        min_cost_idx = i;
+        //                    }
+        //                }
+        //
+        //                // step 3: set path in task
+        //                Path task_path(paths[min_cost_idx], paths[min_cost_idx].size() - 1);
+        //                task->path() = task_path;
+        //            }
+        //
+        //        } else
+        if (task->job_.lock()->type() == JobType::BUILD) {
             // step2: Read device id in config
             // get build index gpu resource
             server::Config& config = server::Config::GetInstance();
@@ -201,12 +203,13 @@ Action::SpecifiedResourceLabelTaskScheduler(ResourceMgrWPtr res_mgr, ResourcePtr
     }
 
     if (resource->name() == task->path().Last()) {
-        resource->WakeupLoader();
+        resource->WakeupExecutor();
     } else {
         auto next_res_name = task->path().Next();
         auto next_res = res_mgr.lock()->GetResource(next_res_name);
-        event->task_table_item_->Move();
-        next_res->task_table().Put(task);
+        if (event->task_table_item_->Move()) {
+            next_res->task_table().Put(task);
+        }
     }
 }
 
diff --git a/cpp/src/scheduler/optimizer/LargeSQ8HPass.cpp b/cpp/src/scheduler/optimizer/LargeSQ8HPass.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..62d0e57902746ab3ac7afdcd4bc002c30dfa03ce
--- /dev/null
+++ b/cpp/src/scheduler/optimizer/LargeSQ8HPass.cpp
@@ -0,0 +1,73 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include "scheduler/optimizer/LargeSQ8HPass.h"
+#include "cache/GpuCacheMgr.h"
+#include "scheduler/SchedInst.h"
+#include "scheduler/Utils.h"
+#include "scheduler/task/SearchTask.h"
+#include "scheduler/tasklabel/SpecResLabel.h"
+#include "utils/Log.h"
+
+namespace milvus {
+namespace scheduler {
+
+bool
+LargeSQ8HPass::Run(const TaskPtr& task) {
+    if (task->Type() != TaskType::SearchTask) {
+        return false;
+    }
+
+    auto search_task = std::static_pointer_cast<XSearchTask>(task);
+    if (search_task->file_->engine_type_ != (int)engine::EngineType::FAISS_IVFSQ8H) {
+        return false;
+    }
+
+    auto search_job = std::static_pointer_cast<SearchJob>(search_task->job_.lock());
+
+    // TODO: future, Index::IVFSQ8H, if nq < threshold set cpu, else set gpu
+    if (search_job->nq() < 100) {
+        return false;
+    }
+
+    std::vector<uint64_t> gpus = scheduler::get_gpu_pool();
+    std::vector<int64_t> all_free_mem;
+    for (auto& gpu : gpus) {
+        auto cache = cache::GpuCacheMgr::GetInstance(gpu);
+        auto free_mem = cache->CacheCapacity() - cache->CacheUsage();
+        all_free_mem.push_back(free_mem);
+    }
+
+    auto max_e = std::max_element(all_free_mem.begin(), all_free_mem.end());
+    auto best_index = std::distance(all_free_mem.begin(), max_e);
+    auto best_device_id = gpus[best_index];
+
+    ResourcePtr res_ptr = ResMgrInst::GetInstance()->GetResource(ResourceType::GPU, best_device_id);
+    if (not res_ptr) {
+        SERVER_LOG_ERROR << "GpuResource " << best_device_id << " invalid.";
+        // TODO: throw critical error and exit
+        return false;
+    }
+
+    auto label = std::make_shared<SpecResLabel>(std::weak_ptr<Resource>(res_ptr));
+    task->label() = label;
+
+    return true;
+}
+
+}  // namespace scheduler
+}  // namespace milvus
diff --git a/cpp/src/scheduler/optimizer/LargeSQ8HPass.h b/cpp/src/scheduler/optimizer/LargeSQ8HPass.h
new file mode 100644
index 0000000000000000000000000000000000000000..49e658002f0696a401b436474eb878d18348d041
--- /dev/null
+++ b/cpp/src/scheduler/optimizer/LargeSQ8HPass.h
@@ -0,0 +1,47 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+#pragma once
+
+#include <condition_variable>
+#include <deque>
+#include <list>
+#include <memory>
+#include <mutex>
+#include <queue>
+#include <string>
+#include <thread>
+#include <unordered_map>
+#include <vector>
+
+#include "Pass.h"
+
+namespace milvus {
+namespace scheduler {
+
+class LargeSQ8HPass : public Pass {
+ public:
+    LargeSQ8HPass() = default;
+
+ public:
+    bool
+    Run(const TaskPtr& task) override;
+};
+
+using LargeSQ8HPassPtr = std::shared_ptr<LargeSQ8HPass>;
+
+}  // namespace scheduler
+}  // namespace milvus
diff --git a/cpp/src/scheduler/resource/Resource.cpp b/cpp/src/scheduler/resource/Resource.cpp
index 8fea475d70b834f92aa66e49e33f1f8848ed7940..7fee0a7709984866a3ec5dc3a1fc9b50cc3e294a 100644
--- a/cpp/src/scheduler/resource/Resource.cpp
+++ b/cpp/src/scheduler/resource/Resource.cpp
@@ -19,6 +19,7 @@
 #include "scheduler/Utils.h"
 
 #include <iostream>
+#include <limits>
 #include <utility>
 
 namespace milvus {
@@ -111,11 +112,18 @@ Resource::pick_task_load() {
 
 TaskTableItemPtr
 Resource::pick_task_execute() {
-    auto indexes = task_table_.PickToExecute(3);
+    auto indexes = task_table_.PickToExecute(std::numeric_limits<uint64_t>::max());
     for (auto index : indexes) {
         // try to set one task executing, then return
-        if (task_table_.Execute(index))
+        if (task_table_[index]->task->label()->Type() == TaskLabelType::SPECIFIED_RESOURCE) {
+            if (task_table_[index]->task->path().Last() != name()) {
+                continue;
+            }
+        }
+
+        if (task_table_.Execute(index)) {
             return task_table_.Get(index);
+        }
         // else try next
     }
     return nullptr;
diff --git a/cpp/src/scheduler/task/SearchTask.cpp b/cpp/src/scheduler/task/SearchTask.cpp
index 9925a8bcf85511d83759ea2fd88aacca1ba7f44a..b7e27e4944a2f9ed1af32f816752056a851ca96e 100644
--- a/cpp/src/scheduler/task/SearchTask.cpp
+++ b/cpp/src/scheduler/task/SearchTask.cpp
@@ -22,6 +22,7 @@
 #include "utils/Log.h"
 #include "utils/TimeRecorder.h"
 
+#include <src/scheduler/SchedInst.h>
 #include <algorithm>
 #include <string>
 #include <thread>
@@ -121,7 +122,11 @@ XSearchTask::Load(LoadType type, uint8_t device_id) {
             stat = index_engine_->Load();
             type_str = "DISK2CPU";
         } else if (type == LoadType::CPU2GPU) {
-            stat = index_engine_->CopyToGpu(device_id);
+            bool hybrid = false;
+            if (index_engine_->IndexEngineType() == engine::EngineType::FAISS_IVFSQ8H) {
+                hybrid = true;
+            }
+            stat = index_engine_->CopyToGpu(device_id, hybrid);
             type_str = "CPU2GPU";
         } else if (type == LoadType::GPU2CPU) {
             stat = index_engine_->CopyToCpu();
@@ -204,7 +209,12 @@ XSearchTask::Execute() {
 
         try {
             // step 2: search
-            index_engine_->Search(nq, vectors, topk, nprobe, output_distance.data(), output_ids.data());
+            bool hybrid = false;
+            if (index_engine_->IndexEngineType() == engine::EngineType::FAISS_IVFSQ8H &&
+                ResMgrInst::GetInstance()->GetResource(path().Last())->type() == ResourceType::CPU) {
+                hybrid = true;
+            }
+            index_engine_->Search(nq, vectors, topk, nprobe, output_distance.data(), output_ids.data(), hybrid);
 
             double span = rc.RecordSection(hdr + ", do search");
             //            search_job->AccumSearchCost(span);
diff --git a/cpp/src/wrapper/VecImpl.cpp b/cpp/src/wrapper/VecImpl.cpp
index 1ed20c8029b76408078fe76b57c33d9f22530e80..c97900f839f23634669675acaa8d1ae229c1dc19 100644
--- a/cpp/src/wrapper/VecImpl.cpp
+++ b/cpp/src/wrapper/VecImpl.cpp
@@ -315,24 +315,40 @@ IVFHybridIndex::UnsetQuantizer() {
     return Status::OK();
 }
 
-Status
+VecIndexPtr
 IVFHybridIndex::LoadData(const knowhere::QuantizerPtr& q, const Config& conf) {
     try {
         // TODO(linxj): Hardcode here
         if (auto new_idx = std::dynamic_pointer_cast<knowhere::IVFSQHybrid>(index_)) {
-            new_idx->LoadData(q, conf);
+            return std::make_shared<IVFHybridIndex>(new_idx->LoadData(q, conf), type);
         } else {
             WRAPPER_LOG_ERROR << "Hybrid mode not support for index type: " << int(type);
-            return Status(KNOWHERE_ERROR, "not support");
         }
     } catch (knowhere::KnowhereException& e) {
         WRAPPER_LOG_ERROR << e.what();
-        return Status(KNOWHERE_UNEXPECTED_ERROR, e.what());
     } catch (std::exception& e) {
         WRAPPER_LOG_ERROR << e.what();
-        return Status(KNOWHERE_ERROR, e.what());
     }
-    return Status::OK();
+    return nullptr;
+}
+
+std::pair<VecIndexPtr, knowhere::QuantizerPtr>
+IVFHybridIndex::CopyToGpuWithQuantizer(const int64_t& device_id, const Config& cfg) {
+    try {
+        // TODO(linxj): Hardcode here
+        if (auto hybrid_idx = std::dynamic_pointer_cast<knowhere::IVFSQHybrid>(index_)) {
+            auto pair = hybrid_idx->CopyCpuToGpuWithQuantizer(device_id, cfg);
+            auto new_idx = std::make_shared<IVFHybridIndex>(pair.first, type);
+            return std::make_pair(new_idx, pair.second);
+        } else {
+            WRAPPER_LOG_ERROR << "Hybrid mode not support for index type: " << int(type);
+        }
+    } catch (knowhere::KnowhereException& e) {
+        WRAPPER_LOG_ERROR << e.what();
+    } catch (std::exception& e) {
+        WRAPPER_LOG_ERROR << e.what();
+    }
+    return std::make_pair(nullptr, nullptr);
 }
 
 }  // namespace engine
diff --git a/cpp/src/wrapper/VecImpl.h b/cpp/src/wrapper/VecImpl.h
index fd9bb79c0a9340229881532b50bbdde1f265820d..22d734cf9244458b43e5bd9f7ac27bda2cd7b52a 100644
--- a/cpp/src/wrapper/VecImpl.h
+++ b/cpp/src/wrapper/VecImpl.h
@@ -105,8 +105,10 @@ class IVFHybridIndex : public IVFMixIndex {
 
     Status
     UnsetQuantizer() override;
+    std::pair<VecIndexPtr, knowhere::QuantizerPtr>
+    CopyToGpuWithQuantizer(const int64_t& device_id, const Config& cfg) override;
 
-    Status
+    VecIndexPtr
     LoadData(const knowhere::QuantizerPtr& q, const Config& conf) override;
 };
 
diff --git a/cpp/src/wrapper/VecIndex.h b/cpp/src/wrapper/VecIndex.h
index f5fdd49466bcd4ce5c8f2ff484dbe8103503f5bd..05da9ccc0374e8752a05fdecd318f9c3d8206702 100644
--- a/cpp/src/wrapper/VecIndex.h
+++ b/cpp/src/wrapper/VecIndex.h
@@ -19,6 +19,7 @@
 
 #include <memory>
 #include <string>
+#include <utility>
 
 #include "cache/DataObj.h"
 #include "knowhere/common/BinarySet.h"
@@ -103,9 +104,9 @@ class VecIndex : public cache::DataObj {
         return nullptr;
     }
 
-    virtual Status
+    virtual VecIndexPtr
     LoadData(const knowhere::QuantizerPtr& q, const Config& conf) {
-        return Status::OK();
+        return nullptr;
     }
 
     virtual Status
@@ -117,6 +118,11 @@ class VecIndex : public cache::DataObj {
     UnsetQuantizer() {
         return Status::OK();
     }
+
+    virtual std::pair<VecIndexPtr, knowhere::QuantizerPtr>
+    CopyToGpuWithQuantizer(const int64_t& device_id, const Config& cfg = Config()) {
+        return std::make_pair(nullptr, nullptr);
+    }
     ////////////////
  private:
     int64_t size_ = 0;
diff --git a/cpp/unittest/scheduler/test_resource_mgr.cpp b/cpp/unittest/scheduler/test_resource_mgr.cpp
index 34e6b50c49fe4df11975a21e860177194c1155d9..2534f66439b790a95fe3532fdc27f5f2a15c1199 100644
--- a/cpp/unittest/scheduler/test_resource_mgr.cpp
+++ b/cpp/unittest/scheduler/test_resource_mgr.cpp
@@ -165,7 +165,9 @@ class ResourceMgrAdvanceTest : public testing::Test {
     SetUp() override {
         mgr1_ = std::make_shared<ResourceMgr>();
         disk_res = std::make_shared<DiskResource>("disk", 0, true, false);
+        cpu_res = std::make_shared<CpuResource>("cpu", 0, true, true);
         mgr1_->Add(ResourcePtr(disk_res));
+        mgr1_->Add(ResourcePtr(cpu_res));
         mgr1_->Start();
     }
 
@@ -176,6 +178,7 @@ class ResourceMgrAdvanceTest : public testing::Test {
 
     ResourceMgrPtr mgr1_;
     ResourcePtr disk_res;
+    ResourcePtr cpu_res;
 };
 
 TEST_F(ResourceMgrAdvanceTest, REGISTER_SUBSCRIBER) {
diff --git a/cpp/unittest/scheduler/test_scheduler.cpp b/cpp/unittest/scheduler/test_scheduler.cpp
index a107040a0b9b72be863766e4e2e47bdbc762d97b..aebdfa2af2aea1da72cce414ae78e9528a35050c 100644
--- a/cpp/unittest/scheduler/test_scheduler.cpp
+++ b/cpp/unittest/scheduler/test_scheduler.cpp
@@ -28,18 +28,17 @@
 #include "utils/Error.h"
 #include "wrapper/VecIndex.h"
 
-
 namespace milvus {
 namespace scheduler {
 
 class MockVecIndex : public engine::VecIndex {
  public:
-    virtual Status BuildAll(const int64_t &nb,
-                            const float *xb,
-                            const int64_t *ids,
-                            const engine::Config &cfg,
-                            const int64_t &nt = 0,
-                            const float *xt = nullptr) {
+    virtual Status BuildAll(const int64_t& nb,
+                            const float* xb,
+                            const int64_t* ids,
+                            const engine::Config& cfg,
+                            const int64_t& nt = 0,
+                            const float* xt = nullptr) {
     }
 
     engine::VecIndexPtr Clone() override {
@@ -54,23 +53,23 @@ class MockVecIndex : public engine::VecIndex {
         return engine::IndexType::INVALID;
     }
 
-    virtual Status Add(const int64_t &nb,
-                       const float *xb,
-                       const int64_t *ids,
-                       const engine::Config &cfg = engine::Config()) {
+    virtual Status Add(const int64_t& nb,
+                       const float* xb,
+                       const int64_t* ids,
+                       const engine::Config& cfg = engine::Config()) {
     }
 
-    virtual Status Search(const int64_t &nq,
-                          const float *xq,
-                          float *dist,
-                          int64_t *ids,
-                          const engine::Config &cfg = engine::Config()) {
+    virtual Status Search(const int64_t& nq,
+                          const float* xq,
+                          float* dist,
+                          int64_t* ids,
+                          const engine::Config& cfg = engine::Config()) {
     }
 
-    engine::VecIndexPtr CopyToGpu(const int64_t &device_id, const engine::Config &cfg) override {
+    engine::VecIndexPtr CopyToGpu(const int64_t& device_id, const engine::Config& cfg) override {
     }
 
-    engine::VecIndexPtr CopyToCpu(const engine::Config &cfg) override {
+    engine::VecIndexPtr CopyToCpu(const engine::Config& cfg) override {
     }
 
     virtual int64_t Dimension() {
@@ -86,7 +85,7 @@ class MockVecIndex : public engine::VecIndex {
         return binset;
     }
 
-    virtual Status Load(const knowhere::BinarySet &index_binary) {
+    virtual Status Load(const knowhere::BinarySet& index_binary) {
     }
 
  public:
@@ -102,11 +101,13 @@ class SchedulerTest : public testing::Test {
         cache::GpuCacheMgr::GetInstance(0)->SetCapacity(cache_cap);
         cache::GpuCacheMgr::GetInstance(1)->SetCapacity(cache_cap);
 
+        ResourcePtr disk = ResourceFactory::Create("disk", "DISK", 0, true, false);
         ResourcePtr cpu = ResourceFactory::Create("cpu", "CPU", 0, true, false);
         ResourcePtr gpu_0 = ResourceFactory::Create("gpu0", "GPU", 0);
         ResourcePtr gpu_1 = ResourceFactory::Create("gpu1", "GPU", 1);
 
         res_mgr_ = std::make_shared<ResourceMgr>();
+        disk_resource_ = res_mgr_->Add(std::move(disk));
         cpu_resource_ = res_mgr_->Add(std::move(cpu));
         gpu_resource_0_ = res_mgr_->Add(std::move(gpu_0));
         gpu_resource_1_ = res_mgr_->Add(std::move(gpu_1));
@@ -127,6 +128,7 @@ class SchedulerTest : public testing::Test {
         res_mgr_->Stop();
     }
 
+    ResourceWPtr disk_resource_;
     ResourceWPtr cpu_resource_;
     ResourceWPtr gpu_resource_0_;
     ResourceWPtr gpu_resource_1_;
@@ -137,7 +139,7 @@ class SchedulerTest : public testing::Test {
 
 void
 insert_dummy_index_into_gpu_cache(uint64_t device_id) {
-    MockVecIndex *mock_index = new MockVecIndex();
+    MockVecIndex* mock_index = new MockVecIndex();
     mock_index->ntotal_ = 1000;
     engine::VecIndexPtr index(mock_index);
 
@@ -224,6 +226,7 @@ class SchedulerTest2 : public testing::Test {
     TearDown() override {
         scheduler_->Stop();
         res_mgr_->Stop();
+        res_mgr_->Clear();
     }
 
     ResourceWPtr disk_;
@@ -237,22 +240,22 @@ class SchedulerTest2 : public testing::Test {
     std::shared_ptr<Scheduler> scheduler_;
 };
 
-TEST_F(SchedulerTest2, SPECIFIED_RESOURCE_TEST) {
-    const uint64_t NUM = 10;
-    std::vector<std::shared_ptr<TestTask>> tasks;
-    TableFileSchemaPtr dummy = std::make_shared<TableFileSchema>();
-    dummy->location_ = "location";
-
-    for (uint64_t i = 0; i < NUM; ++i) {
-        auto label = std::make_shared<DefaultLabel>();
-        std::shared_ptr<TestTask> task = std::make_shared<TestTask>(dummy, label);
-        task->label() = std::make_shared<SpecResLabel>(disk_);
-        tasks.push_back(task);
-        disk_.lock()->task_table().Put(task);
-    }
+//TEST_F(SchedulerTest2, SPECIFIED_RESOURCE_TEST) {
+//    const uint64_t NUM = 2;
+//    std::vector<std::shared_ptr<TestTask>> tasks;
+//    TableFileSchemaPtr dummy = std::make_shared<TableFileSchema>();
+//    dummy->location_ = "location";
+//
+//    for (uint64_t i = 0; i < NUM; ++i) {
+//        auto label = std::make_shared<DefaultLabel>();
+//        std::shared_ptr<TestTask> task = std::make_shared<TestTask>(dummy, label);
+//        task->label() = std::make_shared<SpecResLabel>(disk_);
+//        tasks.push_back(task);
+//        disk_.lock()->task_table().Put(task);
+//    }
 
 //    ASSERT_EQ(res_mgr_->GetResource(ResourceType::GPU, 1)->task_table().Size(), NUM);
-}
+//}
 
 } // namespace scheduler
 } // namespace milvus