diff --git a/sdk/examples/simple/src/ClientTest.cpp b/sdk/examples/simple/src/ClientTest.cpp
index f9b67f51069b42aa4d9776890de17fc417b7637e..58d0927af80989976aaae31dfc51561b791ce97d 100644
--- a/sdk/examples/simple/src/ClientTest.cpp
+++ b/sdk/examples/simple/src/ClientTest.cpp
@@ -30,11 +30,11 @@ constexpr milvus::MetricType COLLECTION_METRIC_TYPE = milvus::MetricType::L2;
 constexpr int64_t BATCH_ENTITY_COUNT = 10000;
 constexpr int64_t NQ = 5;
 constexpr int64_t TOP_K = 10;
-constexpr int64_t NPROBE = 32;
+constexpr int64_t NPROBE = 16;
 constexpr int64_t SEARCH_TARGET = BATCH_ENTITY_COUNT / 2;  // change this value, result is different
 constexpr int64_t ADD_ENTITY_LOOP = 10;
 constexpr milvus::IndexType INDEX_TYPE = milvus::IndexType::IVFFLAT;
-constexpr int32_t NLIST = 16384;
+constexpr int32_t NLIST = 1024;
 const char* PARTITION_TAG = "part";
 const char* DIMENSION = "dim";
 const char* METRICTYPE = "metric_type";
@@ -114,6 +114,7 @@ ClientTest::CreateCollection(const std::string& collection_name) {
 
     JSON extra_params;
     extra_params["segment_row_count"] = 1024;
+    extra_params["auto_id"] = false;
     milvus::Mapping mapping = {collection_name, {field_ptr1, field_ptr2, field_ptr3, field_ptr4}};
 
     milvus::Status stat = conn_->CreateCollection(mapping, extra_params.dump());
@@ -140,7 +141,6 @@ ClientTest::InsertEntities(const std::string& collection_name) {
             milvus_sdk::Utils::BuildEntities(begin_index, begin_index + BATCH_ENTITY_COUNT, field_value, entity_ids,
                                              COLLECTION_DIMENSION);
         }
-        entity_ids.clear();
         milvus::Status status = conn_->Insert(collection_name, "", field_value, entity_ids);
         search_id_array_.emplace_back(entity_ids[10]);
         std::cout << "InsertEntities function call status: " << status.message() << std::endl;
@@ -335,7 +335,7 @@ ClientTest::Test() {
     InsertEntities(collection_name);
     Flush(collection_name);
     CountEntities(collection_name);
-    CreateIndex(collection_name, 1024);
+    CreateIndex(collection_name, NLIST);
     GetCollectionInfo(collection_name);
     //    GetCollectionStats(collection_name);
     //
@@ -355,5 +355,5 @@ ClientTest::Test() {
     //    entities
     //
     //    DropIndex(collection_name, "field_vec", "index_3");
-    //    DropCollection(collection_name);
+    DropCollection(collection_name);
 }