diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0786e2b5bf..594e886904 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - \#440 - Server cannot startup with gpu_resource_config.enable=false in GPU version
 - \#458 - Index data is not compatible between 0.5 and 0.6
 - \#465 - Server hang caused by searching with nsg index
+- \#485 - Increase code coverage rate
 - \#486 - gpu no usage during index building
 - \#497 - CPU-version search performance decreased
 - \#504 - The code coverage rate of core/src/scheduler/optimizer is too low
diff --git a/core/src/db/engine/ExecutionEngineImpl.cpp b/core/src/db/engine/ExecutionEngineImpl.cpp
index 397ca89d68..5a3d6e5e2a 100644
--- a/core/src/db/engine/ExecutionEngineImpl.cpp
+++ b/core/src/db/engine/ExecutionEngineImpl.cpp
@@ -112,10 +112,12 @@ ExecutionEngineImpl::CreatetVecIndex(EngineType type) {
             index = GetVecIndexFactory(IndexType::NSG_MIX);
             break;
         }
+#ifdef CUSTOMIZATION
         case EngineType::FAISS_IVFSQ8H: {
             index = GetVecIndexFactory(IndexType::FAISS_IVFSQ8_HYBRID);
             break;
         }
+#endif
         case EngineType::FAISS_PQ: {
 #ifdef MILVUS_CPU_VERSION
             index = GetVecIndexFactory(IndexType::FAISS_IVFPQ_CPU);
diff --git a/core/unittest/db/test_engine.cpp b/core/unittest/db/test_engine.cpp
index 67070df41b..e0edd05537 100644
--- a/core/unittest/db/test_engine.cpp
+++ b/core/unittest/db/test_engine.cpp
@@ -59,6 +59,29 @@ TEST_F(EngineTest, FACTORY_TEST) {
 
         ASSERT_TRUE(engine_ptr != nullptr);
     }
+
+    {
+        auto engine_ptr = milvus::engine::EngineFactory::Build(
+                512, "/tmp/milvus_index_1", milvus::engine::EngineType::FAISS_PQ, milvus::engine::MetricType::IP, 1024);
+
+        ASSERT_TRUE(engine_ptr != nullptr);
+    }
+
+    {
+        auto engine_ptr = milvus::engine::EngineFactory::Build(
+                512, "/tmp/milvus_index_1", milvus::engine::EngineType::SPTAG_KDT,
+                milvus::engine::MetricType::L2, 1024);
+
+        ASSERT_TRUE(engine_ptr != nullptr);
+    }
+
+    {
+        auto engine_ptr = milvus::engine::EngineFactory::Build(
+                512, "/tmp/milvus_index_1", milvus::engine::EngineType::SPTAG_KDT,
+                milvus::engine::MetricType::L2, 1024);
+
+        ASSERT_TRUE(engine_ptr != nullptr);
+    }
 }
 
 TEST_F(EngineTest, ENGINE_IMPL_TEST) {
@@ -69,7 +92,7 @@ TEST_F(EngineTest, ENGINE_IMPL_TEST) {
 
     std::vector<float> data;
     std::vector<int64_t> ids;
-    const int row_count = 10000;
+    const int row_count = 500;
     data.reserve(row_count * dimension);
     ids.reserve(row_count);
     for (int64_t i = 0; i < row_count; i++) {
@@ -95,5 +118,8 @@ TEST_F(EngineTest, ENGINE_IMPL_TEST) {
     // ASSERT_TRUE(status.ok());
 
     auto engine_build = engine_ptr->BuildIndex("/tmp/milvus_index_2", milvus::engine::EngineType::FAISS_IVFSQ8);
+    engine_build = engine_ptr->BuildIndex("/tmp/milvus_index_3", milvus::engine::EngineType::FAISS_PQ);
+    engine_build = engine_ptr->BuildIndex("/tmp/milvus_index_4", milvus::engine::EngineType::SPTAG_KDT);
+    engine_build = engine_ptr->BuildIndex("/tmp/milvus_index_5", milvus::engine::EngineType::SPTAG_BKT);
     // ASSERT_TRUE(status.ok());
 }