diff --git a/core/src/config/Config.cpp b/core/src/config/Config.cpp
index 63688ae493..fb70c4b779 100644
--- a/core/src/config/Config.cpp
+++ b/core/src/config/Config.cpp
@@ -113,6 +113,8 @@ const char* CONFIG_ENGINE_OMP_THREAD_NUM = "omp_thread_num";
 const char* CONFIG_ENGINE_OMP_THREAD_NUM_DEFAULT = "0";
 const char* CONFIG_ENGINE_SIMD_TYPE = "simd_type";
 const char* CONFIG_ENGINE_SIMD_TYPE_DEFAULT = "auto";
+const char* CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ = "search_combine_nq";
+const char* CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ_DEFAULT = "64";
 
 /* gpu resource config */
 const char* CONFIG_GPU_RESOURCE = "gpu";
@@ -198,6 +200,9 @@ Config::Config() {
     std::string node_blas_threshold = std::string(CONFIG_ENGINE) + "." + CONFIG_ENGINE_USE_BLAS_THRESHOLD;
     config_callback_[node_blas_threshold] = empty_map;
 
+    std::string node_search_combine = std::string(CONFIG_ENGINE) + "." + CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ;
+    config_callback_[node_search_combine] = empty_map;
+
     // gpu resources config
     std::string node_gpu_enable = std::string(CONFIG_GPU_RESOURCE) + "." + CONFIG_GPU_RESOURCE_ENABLE;
     config_callback_[node_gpu_enable] = empty_map;
@@ -451,6 +456,7 @@ Config::ResetDefaultConfig() {
     STATUS_CHECK(SetEngineConfigUseBlasThreshold(CONFIG_ENGINE_USE_BLAS_THRESHOLD_DEFAULT));
     STATUS_CHECK(SetEngineConfigOmpThreadNum(CONFIG_ENGINE_OMP_THREAD_NUM_DEFAULT));
     STATUS_CHECK(SetEngineConfigSimdType(CONFIG_ENGINE_SIMD_TYPE_DEFAULT));
+    STATUS_CHECK(SetEngineSearchCombineMaxNq(CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ_DEFAULT));
 
     /* gpu resource config */
 #ifdef MILVUS_GPU_VERSION
@@ -578,6 +584,8 @@ Config::SetConfigCli(const std::string& parent_key, const std::string& child_key
             status = SetEngineConfigOmpThreadNum(value);
         } else if (child_key == CONFIG_ENGINE_SIMD_TYPE) {
             status = SetEngineConfigSimdType(value);
+        } else if (child_key == CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ) {
+            status = SetEngineSearchCombineMaxNq(value);
         } else {
             status = Status(SERVER_UNEXPECTED_ERROR, invalid_node_str);
         }
@@ -1344,6 +1352,18 @@ Config::CheckEngineConfigSimdType(const std::string& value) {
     return Status::OK();
 }
 
+Status
+Config::CheckEngineSearchCombineMaxNq(const std::string& value) {
+    fiu_return_on("check_config_search_combine_nq_fail", Status(SERVER_INVALID_ARGUMENT, ""));
+
+    if (!ValidationUtil::ValidateStringIsNumber(value).ok()) {
+        std::string msg = "Invalid omp thread num: " + value +
+                          ". Possible reason: engine_config.omp_thread_num is not a positive integer.";
+        return Status(SERVER_INVALID_ARGUMENT, msg);
+    }
+    return Status::OK();
+}
+
 /* gpu resource config */
 #ifdef MILVUS_GPU_VERSION
 Status
@@ -1967,6 +1987,15 @@ Config::GetEngineConfigSimdType(std::string& value) {
     return CheckEngineConfigSimdType(value);
 }
 
+Status
+Config::GetEngineSearchCombineMaxNq(int64_t& value) {
+    std::string str =
+        GetConfigStr(CONFIG_ENGINE, CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ, CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ_DEFAULT);
+    //    STATUS_CHECK(CheckEngineSearchCombineMaxNq(str));
+    value = std::stoll(str);
+    return Status::OK();
+}
+
 /* gpu resource config */
 #ifdef MILVUS_GPU_VERSION
 Status
@@ -2361,8 +2390,16 @@ Config::SetEngineConfigSimdType(const std::string& value) {
     return SetConfigValueInMem(CONFIG_ENGINE, CONFIG_ENGINE_SIMD_TYPE, value);
 }
 
+Status
+Config::SetEngineSearchCombineMaxNq(const std::string& value) {
+    STATUS_CHECK(CheckEngineSearchCombineMaxNq(value));
+    STATUS_CHECK(SetConfigValueInMem(CONFIG_ENGINE, CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ, value));
+    return ExecCallBacks(CONFIG_ENGINE, CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ, value);
+}
+
 /* gpu resource config */
 #ifdef MILVUS_GPU_VERSION
+
 Status
 Config::SetGpuResourceConfigEnable(const std::string& value) {
     STATUS_CHECK(CheckGpuResourceConfigEnable(value));
@@ -2407,6 +2444,7 @@ Config::SetGpuResourceConfigBuildIndexResources(const std::string& value) {
     STATUS_CHECK(SetConfigValueInMem(CONFIG_GPU_RESOURCE, CONFIG_GPU_RESOURCE_BUILD_INDEX_RESOURCES, value));
     return ExecCallBacks(CONFIG_GPU_RESOURCE, CONFIG_GPU_RESOURCE_BUILD_INDEX_RESOURCES, value);
 }
+
 #endif
 
 /* tracing config */
diff --git a/core/src/config/Config.h b/core/src/config/Config.h
index 1819c0c1e1..563b2eb487 100644
--- a/core/src/config/Config.h
+++ b/core/src/config/Config.h
@@ -100,6 +100,8 @@ extern const char* CONFIG_ENGINE_OMP_THREAD_NUM;
 extern const char* CONFIG_ENGINE_OMP_THREAD_NUM_DEFAULT;
 extern const char* CONFIG_ENGINE_SIMD_TYPE;
 extern const char* CONFIG_ENGINE_SIMD_TYPE_DEFAULT;
+extern const char* CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ;
+extern const char* CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ_DEFAULT;
 
 /* gpu resource config */
 extern const char* CONFIG_GPU_RESOURCE;
@@ -264,6 +266,8 @@ class Config {
     CheckEngineConfigOmpThreadNum(const std::string& value);
     Status
     CheckEngineConfigSimdType(const std::string& value);
+    Status
+    CheckEngineSearchCombineMaxNq(const std::string& value);
 
     /* gpu resource config */
 #ifdef MILVUS_GPU_VERSION
@@ -382,6 +386,8 @@ class Config {
     GetEngineConfigOmpThreadNum(int64_t& value);
     Status
     GetEngineConfigSimdType(std::string& value);
+    Status
+    GetEngineSearchCombineMaxNq(int64_t& value);
 
     /* gpu resource config */
 #ifdef MILVUS_GPU_VERSION
@@ -492,6 +498,8 @@ class Config {
     SetEngineConfigOmpThreadNum(const std::string& value);
     Status
     SetEngineConfigSimdType(const std::string& value);
+    Status
+    SetEngineSearchCombineMaxNq(const std::string& value);
 
     /* gpu resource config */
 #ifdef MILVUS_GPU_VERSION
diff --git a/core/src/config/handler/EngineConfigHandler.cpp b/core/src/config/handler/EngineConfigHandler.cpp
index 51b08e17ba..e838bc0773 100644
--- a/core/src/config/handler/EngineConfigHandler.cpp
+++ b/core/src/config/handler/EngineConfigHandler.cpp
@@ -19,10 +19,12 @@ namespace server {
 EngineConfigHandler::EngineConfigHandler() {
     auto& config = Config::GetInstance();
     config.GetEngineConfigUseBlasThreshold(use_blas_threshold_);
+    config.GetEngineSearchCombineMaxNq(search_combine_nq_);
 }
 
 EngineConfigHandler::~EngineConfigHandler() {
     RemoveUseBlasThresholdListener();
+    RemoveSearchCombineMaxNqListener();
 }
 
 //////////////////////////// Listener methods //////////////////////////////////
@@ -48,5 +50,27 @@ EngineConfigHandler::RemoveUseBlasThresholdListener() {
     config.CancelCallBack(CONFIG_ENGINE, CONFIG_ENGINE_USE_BLAS_THRESHOLD, identity_);
 }
 
+void
+EngineConfigHandler::AddSearchCombineMaxNqListener() {
+    ConfigCallBackF lambda = [this](const std::string& value) -> Status {
+        auto& config = server::Config::GetInstance();
+        auto status = config.GetEngineSearchCombineMaxNq(search_combine_nq_);
+        if (status.ok()) {
+            OnSearchCombineMaxNqChanged(search_combine_nq_);
+        }
+
+        return status;
+    };
+
+    auto& config = Config::GetInstance();
+    config.RegisterCallBack(CONFIG_ENGINE, CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ, identity_, lambda);
+}
+
+void
+EngineConfigHandler::RemoveSearchCombineMaxNqListener() {
+    auto& config = Config::GetInstance();
+    config.CancelCallBack(CONFIG_ENGINE, CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ, identity_);
+}
+
 }  // namespace server
 }  // namespace milvus
diff --git a/core/src/config/handler/EngineConfigHandler.h b/core/src/config/handler/EngineConfigHandler.h
index ebc055c7c8..3fed6c9847 100644
--- a/core/src/config/handler/EngineConfigHandler.h
+++ b/core/src/config/handler/EngineConfigHandler.h
@@ -28,16 +28,27 @@ class EngineConfigHandler : virtual public ConfigHandler {
     OnUseBlasThresholdChanged(int64_t threshold) {
     }
 
+    virtual void
+    OnSearchCombineMaxNqChanged(int64_t nq) {
+        search_combine_nq_ = nq;
+    }
+
  protected:
     void
     AddUseBlasThresholdListener();
 
- protected:
     void
     RemoveUseBlasThresholdListener();
 
+    void
+    AddSearchCombineMaxNqListener();
+
+    void
+    RemoveSearchCombineMaxNqListener();
+
  protected:
     int64_t use_blas_threshold_ = std::stoll(CONFIG_ENGINE_USE_BLAS_THRESHOLD_DEFAULT);
+    int64_t search_combine_nq_ = std::stoll(CONFIG_ENGINE_SEARCH_COMBINE_MAX_NQ_DEFAULT);
 };
 
 }  // namespace server
diff --git a/core/src/server/delivery/request/SearchCombineRequest.cpp b/core/src/server/delivery/request/SearchCombineRequest.cpp
index 6dca3dd96b..d53e3e6394 100644
--- a/core/src/server/delivery/request/SearchCombineRequest.cpp
+++ b/core/src/server/delivery/request/SearchCombineRequest.cpp
@@ -27,7 +27,6 @@ namespace server {
 namespace {
 
 constexpr int64_t MAX_TOPK_GAP = 200;
-constexpr uint64_t MAX_NQ = 200;
 
 void
 GetUniqueList(const std::vector<std::string>& list, std::set<std::string>& unique_list) {
@@ -93,7 +92,8 @@ class TracingContextList {
 
 }  // namespace
 
-SearchCombineRequest::SearchCombineRequest() : BaseRequest(nullptr, BaseRequest::kSearchCombine) {
+SearchCombineRequest::SearchCombineRequest(int64_t max_nq)
+    : BaseRequest(nullptr, BaseRequest::kSearchCombine), combine_max_nq_(max_nq) {
 }
 
 Status
@@ -133,6 +133,8 @@ SearchCombineRequest::Combine(const SearchRequestPtr& request) {
     }
 
     request_list_.push_back(request);
+    vectors_data_.vector_count_ += request->VectorsData().vector_count_;
+
     return Status::OK();
 }
 
@@ -152,11 +154,11 @@ SearchCombineRequest::CanCombine(const SearchRequestPtr& request) {
     }
 
     // sum of nq must less-equal than MAX_NQ
-    if (vectors_data_.vector_count_ > MAX_NQ || request->VectorsData().vector_count_ > MAX_NQ) {
+    if (vectors_data_.vector_count_ > combine_max_nq_ || request->VectorsData().vector_count_ > combine_max_nq_) {
         return false;
     }
     uint64_t total_nq = vectors_data_.vector_count_ + request->VectorsData().vector_count_;
-    if (total_nq > MAX_NQ) {
+    if (total_nq > combine_max_nq_) {
         return false;
     }
 
@@ -178,7 +180,7 @@ SearchCombineRequest::CanCombine(const SearchRequestPtr& request) {
 }
 
 bool
-SearchCombineRequest::CanCombine(const SearchRequestPtr& left, const SearchRequestPtr& right) {
+SearchCombineRequest::CanCombine(const SearchRequestPtr& left, const SearchRequestPtr& right, int64_t max_nq) {
     if (left->CollectionName() != right->CollectionName()) {
         return false;
     }
@@ -193,11 +195,11 @@ SearchCombineRequest::CanCombine(const SearchRequestPtr& left, const SearchReque
     }
 
     // sum of nq must less-equal than MAX_NQ
-    if (left->VectorsData().vector_count_ > MAX_NQ || right->VectorsData().vector_count_ > MAX_NQ) {
+    if (left->VectorsData().vector_count_ > max_nq || right->VectorsData().vector_count_ > max_nq) {
         return false;
     }
     uint64_t total_nq = left->VectorsData().vector_count_ + right->VectorsData().vector_count_;
-    if (total_nq > MAX_NQ) {
+    if (total_nq > max_nq) {
         return false;
     }
 
diff --git a/core/src/server/delivery/request/SearchCombineRequest.h b/core/src/server/delivery/request/SearchCombineRequest.h
index 3aa24bb928..a455c130d9 100644
--- a/core/src/server/delivery/request/SearchCombineRequest.h
+++ b/core/src/server/delivery/request/SearchCombineRequest.h
@@ -22,9 +22,11 @@
 namespace milvus {
 namespace server {
 
+constexpr int64_t COMBINE_MAX_NQ = 64;
+
 class SearchCombineRequest : public BaseRequest {
  public:
-    SearchCombineRequest();
+    SearchCombineRequest(int64_t max_nq = COMBINE_MAX_NQ);
 
     Status
     Combine(const SearchRequestPtr& request);
@@ -33,7 +35,7 @@ class SearchCombineRequest : public BaseRequest {
     CanCombine(const SearchRequestPtr& request);
 
     static bool
-    CanCombine(const SearchRequestPtr& left, const SearchRequestPtr& right);
+    CanCombine(const SearchRequestPtr& left, const SearchRequestPtr& right, int64_t max_nq = COMBINE_MAX_NQ);
 
  protected:
     Status
@@ -54,6 +56,8 @@ class SearchCombineRequest : public BaseRequest {
     std::set<std::string> file_id_list_;
 
     std::vector<SearchRequestPtr> request_list_;
+
+    int64_t combine_max_nq_ = COMBINE_MAX_NQ;
 };
 
 using SearchCombineRequestPtr = std::shared_ptr<SearchCombineRequest>;
diff --git a/core/src/server/delivery/strategy/SearchReqStrategy.cpp b/core/src/server/delivery/strategy/SearchReqStrategy.cpp
index 3b49ed6964..0b66ca7b57 100644
--- a/core/src/server/delivery/strategy/SearchReqStrategy.cpp
+++ b/core/src/server/delivery/strategy/SearchReqStrategy.cpp
@@ -10,6 +10,7 @@
 // or implied. See the License for the specific language governing permissions and limitations under the License.
 
 #include "server/delivery/strategy/SearchReqStrategy.h"
+#include "config/Config.h"
 #include "server/delivery/request/SearchCombineRequest.h"
 #include "server/delivery/request/SearchRequest.h"
 #include "utils/CommonUtil.h"
@@ -24,6 +25,8 @@ namespace milvus {
 namespace server {
 
 SearchReqStrategy::SearchReqStrategy() {
+    SetIdentity("SearchReqStrategy");
+    AddSearchCombineMaxNqListener();
 }
 
 Status
@@ -34,15 +37,21 @@ SearchReqStrategy::ReScheduleQueue(const BaseRequestPtr& request, std::queue<Bas
         return Status(SERVER_UNSUPPORTED_ERROR, msg);
     }
 
+    // if config set to 0, neve combine
+    if (search_combine_nq_ <= 0) {
+        queue.push(request);
+        return Status::OK();
+    }
+
     //    TimeRecorderAuto rc("SearchReqStrategy::ReScheduleQueue");
     SearchRequestPtr new_search_req = std::static_pointer_cast<SearchRequest>(request);
 
     BaseRequestPtr last_req = queue.back();
     if (last_req->GetRequestType() == BaseRequest::kSearch) {
         SearchRequestPtr last_search_req = std::static_pointer_cast<SearchRequest>(last_req);
-        if (SearchCombineRequest::CanCombine(last_search_req, new_search_req)) {
+        if (SearchCombineRequest::CanCombine(last_search_req, new_search_req, search_combine_nq_)) {
             // combine request
-            SearchCombineRequestPtr combine_request = std::make_shared<SearchCombineRequest>();
+            SearchCombineRequestPtr combine_request = std::make_shared<SearchCombineRequest>(search_combine_nq_);
             combine_request->Combine(last_search_req);
             combine_request->Combine(new_search_req);
             queue.back() = combine_request;  // replace the last request to combine request
diff --git a/core/src/server/delivery/strategy/SearchReqStrategy.h b/core/src/server/delivery/strategy/SearchReqStrategy.h
index 20093c66c2..3d2c3de03b 100644
--- a/core/src/server/delivery/strategy/SearchReqStrategy.h
+++ b/core/src/server/delivery/strategy/SearchReqStrategy.h
@@ -11,6 +11,7 @@
 
 #pragma once
 
+#include "config/handler/EngineConfigHandler.h"
 #include "server/delivery/strategy/RequestStrategy.h"
 #include "utils/Status.h"
 
@@ -20,7 +21,7 @@
 namespace milvus {
 namespace server {
 
-class SearchReqStrategy : public RequestStrategy {
+class SearchReqStrategy : public RequestStrategy, public EngineConfigHandler {
  public:
     SearchReqStrategy();