diff --git a/cpp/unittest/db/db_tests.cpp b/cpp/unittest/db/db_tests.cpp
index 67d61a05c29ef96b35db9e82c876561f657a7d92..50724eddc3d513ab084b217f3f4e0cc0a5a9e41a 100644
--- a/cpp/unittest/db/db_tests.cpp
+++ b/cpp/unittest/db/db_tests.cpp
@@ -378,11 +378,11 @@ TEST_F(DBTest, INDEX_TEST) {
     ASSERT_TRUE(stat.ok());
 
     engine::TableIndex index_out;
-    stat = db_->DescribeIndex(table_info.table_id_, index);
+    stat = db_->DescribeIndex(table_info.table_id_, index_out);
     ASSERT_TRUE(stat.ok());
     ASSERT_EQ(index.engine_type_, index_out.engine_type_);
     ASSERT_EQ(index.nlist_, index_out.nlist_);
-    ASSERT_EQ(index.metric_type_, index_out.metric_type_);
+    ASSERT_EQ(table_info.metric_type_, index_out.metric_type_);
 
     stat = db_->DropIndex(table_info.table_id_);
     ASSERT_TRUE(stat.ok());
diff --git a/cpp/unittest/db/utils.cpp b/cpp/unittest/db/utils.cpp
index 5b8d82522d320f02aacefbe09ebe9f55d0cbde8d..f598fb1f8ac1d0dbfaf89437c007f832609a03e3 100644
--- a/cpp/unittest/db/utils.cpp
+++ b/cpp/unittest/db/utils.cpp
@@ -13,6 +13,7 @@
 #include "db/Factories.h"
 #include "db/Options.h"
 #include "server/ServerConfig.h"
+#include "knowhere/index/vector_index/gpu_ivf.h"
 
 INITIALIZE_EASYLOGGINGPP
 
@@ -59,6 +60,8 @@ engine::Options BaseTest::GetOptions() {
 void DBTest::SetUp() {
     BaseTest::SetUp();
 
+    zilliz::knowhere::FaissGpuResourceMgr::GetInstance().InitDevice(0, 1024*1024*200, 1024*1024*300, 2);
+
     server::ConfigNode& config = server::ServerConfig::GetInstance().GetConfig(server::CONFIG_CACHE);
     config.AddSequenceItem(server::CONFIG_GPU_IDS, "0");
 
@@ -84,6 +87,8 @@ void DBTest::TearDown() {
     db_->DropAll();
     delete db_;
 
+    zilliz::knowhere::FaissGpuResourceMgr::GetInstance().Free();
+
     engine::ResMgrInst::GetInstance()->Stop();
     engine::SchedInst::GetInstance()->Stop();