diff --git a/cpp/src/db/ExecutionEngineImpl.cpp b/cpp/src/db/ExecutionEngineImpl.cpp
index 85372d619d..bba29fc9a0 100644
--- a/cpp/src/db/ExecutionEngineImpl.cpp
+++ b/cpp/src/db/ExecutionEngineImpl.cpp
@@ -183,9 +183,9 @@ VecIndexPtr ExecutionEngineImpl::Load(const std::string &location) {
         reader(bin, bin_length);
         rp += bin_length;
 
-        auto xx = std::make_shared<uint8_t>();
-        xx.reset(bin);
-        load_data_list.Append(std::string(meta, meta_length), xx, bin_length);
+        auto binptr = std::make_shared<uint8_t>();
+        binptr.reset(bin);
+        load_data_list.Append(std::string(meta, meta_length), binptr, bin_length);
     }
 
     auto index_type = IndexType::INVALID;
@@ -206,6 +206,10 @@ VecIndexPtr ExecutionEngineImpl::Load(const std::string &location) {
             index_type = IndexType::SPTAG_KDT_RNT_CPU;
             break;
         }
+        default: {
+            ENGINE_LOG_ERROR << "wrong index_type";
+            return nullptr;
+        }
     }
 
     return LoadVecIndex(index_type, load_data_list);
diff --git a/cpp/src/wrapper/knowhere/vec_index.cpp b/cpp/src/wrapper/knowhere/vec_index.cpp
index b71eb0f4b7..17aa428613 100644
--- a/cpp/src/wrapper/knowhere/vec_index.cpp
+++ b/cpp/src/wrapper/knowhere/vec_index.cpp
@@ -32,15 +32,22 @@ VecIndexPtr GetVecIndexFactory(const IndexType &type) {
             index = std::make_shared<zilliz::knowhere::GPUIVF>(0);
             break;
         }
+        case IndexType::FAISS_IVFPQ_CPU: {
+            index = std::make_shared<zilliz::knowhere::IVFPQ>();
+            break;
+        }
+        case IndexType::FAISS_IVFPQ_GPU: {
+            index = std::make_shared<zilliz::knowhere::GPUIVFPQ>(0);
+            break;
+        }
         case IndexType::SPTAG_KDT_RNT_CPU: {
             index = std::make_shared<zilliz::knowhere::CPUKDTRNG>();
             break;
         }
-            //// TODO(linxj): Support NSG
-            //case IndexType ::NSG: {
-            //    index = std::make_shared<zilliz::knowhere::NSG>();
-            //    break;
-            //}
+        //case IndexType::NSG: { // TODO(linxj): bug.
+        //    index = std::make_shared<zilliz::knowhere::NSG>();
+        //    break;
+        //}
         default: {
             return nullptr;
         }
diff --git a/cpp/src/wrapper/knowhere/vec_index.h b/cpp/src/wrapper/knowhere/vec_index.h
index 8e471b5213..76c69537b5 100644
--- a/cpp/src/wrapper/knowhere/vec_index.h
+++ b/cpp/src/wrapper/knowhere/vec_index.h
@@ -54,10 +54,12 @@ using VecIndexPtr = std::shared_ptr<VecIndex>;
 enum class IndexType {
     INVALID = 0,
     FAISS_IDMAP = 1,
-    FAISS_IVFFLAT_GPU,
     FAISS_IVFFLAT_CPU,
+    FAISS_IVFFLAT_GPU,
+    FAISS_IVFPQ_CPU,
+    FAISS_IVFPQ_GPU,
     SPTAG_KDT_RNT_CPU,
-    NSG,
+    //NSG,
 };
 
 extern VecIndexPtr GetVecIndexFactory(const IndexType &type);