diff --git a/core/src/sdk/examples/partition/src/ClientTest.cpp b/core/src/sdk/examples/partition/src/ClientTest.cpp
index b67b1fe907..79ed7646b9 100644
--- a/core/src/sdk/examples/partition/src/ClientTest.cpp
+++ b/core/src/sdk/examples/partition/src/ClientTest.cpp
@@ -78,7 +78,7 @@ ClientTest::Test(const std::string &address, const std::string &port) {
         stat = conn->Connect(param);
         std::cout << "Connect function call status: " << stat.message() << std::endl;
     }
-#ifdef yhz
+
     {  // create table
         milvus::TableSchema tb_schema = BuildTableSchema();
         stat = conn->CreateTable(tb_schema);
@@ -202,5 +202,4 @@ ClientTest::Test(const std::string &address, const std::string &port) {
     }
 
     milvus::Connection::Destroy(conn);
-#endif
 }
diff --git a/core/src/sdk/examples/simple/main.cpp b/core/src/sdk/examples/simple/main.cpp
index d9b6194329..c08741606c 100644
--- a/core/src/sdk/examples/simple/main.cpp
+++ b/core/src/sdk/examples/simple/main.cpp
@@ -36,7 +36,7 @@ main(int argc, char* argv[]) {
                                            {nullptr, 0, nullptr, 0}};
 
     int option_index = 0;
-    std::string address = "192.168.1.89", port = "19530";
+    std::string address = "127.0.0.1", port = "19530";
     app_name = argv[0];
 
     int value;
diff --git a/core/src/sdk/examples/simple/src/ClientTest.cpp b/core/src/sdk/examples/simple/src/ClientTest.cpp
index da43f2f2aa..dfa5e2219e 100644
--- a/core/src/sdk/examples/simple/src/ClientTest.cpp
+++ b/core/src/sdk/examples/simple/src/ClientTest.cpp
@@ -68,7 +68,7 @@ ClientTest::Test(const std::string& address, const std::string& port) {
         stat = conn->Connect(param);
         std::cout << "Connect function call status: " << stat.message() << std::endl;
     }
-#ifdef yhz
+
     {  // server version
         std::string version = conn->ServerVersion();
         std::cout << "Server version: " << version << std::endl;
@@ -206,5 +206,4 @@ ClientTest::Test(const std::string& address, const std::string& port) {
         std::string status = conn->ServerStatus();
         std::cout << "Server status after disconnect: " << status << std::endl;
     }
-#endif
 }
diff --git a/core/src/sdk/grpc/ClientProxy.cpp b/core/src/sdk/grpc/ClientProxy.cpp
index 1805ae81fe..4a9c319b4d 100644
--- a/core/src/sdk/grpc/ClientProxy.cpp
+++ b/core/src/sdk/grpc/ClientProxy.cpp
@@ -43,28 +43,16 @@ Status
 ClientProxy::Connect(const ConnectParam& param) {
     std::string uri = param.ip_address + ":" + param.port;
 
-//    channel_ = ::grpc::CreateChannel(uri, ::grpc::InsecureChannelCredentials());
-
-//    channel_ = std::make_shared<grpc_channel>(grpc_insecure_channel_create(uri.c_str(), nullptr, nullptr));
-//    channel_ = std::shared_ptr<grpc_channel>(grpc_insecure_channel_create(uri.c_str(), nullptr, nullptr));
-    auto uri_str = uri.c_str();
-    grpc_channel * channel = grpc_insecure_channel_create(uri_str, nullptr, nullptr);
-//    grpc_insecure_channel_create(uri.c_str(), nullptr, nullptr);
-    auto state = grpc_channel_check_connectivity_state(channel, true);
-    if (state == GRPC_CHANNEL_READY) {
-        std::cout << "Connect " << uri << " successfully";
-    } else {
-        std::cout << "Connect " << uri << " failed.";
+    channel_ = ::grpc::CreateChannel(uri, ::grpc::InsecureChannelCredentials());
+    if (channel_ != nullptr) {
+        connected_ = true;
+        client_ptr_ = std::make_shared<GrpcClient>(channel_);
+        return Status::OK();
     }
-//    if (channel_ != nullptr) {
-//        connected_ = true;
-//        client_ptr_ = std::make_shared<GrpcClient>(channel_);
-//        return Status::OK();
-//    }
 
-//    std::string reason = "connect failed!";
-//    connected_ = false;
-//    return Status(StatusCode::NotConnected, reason);
+    std::string reason = "connect failed!";
+    connected_ = false;
+    return Status(StatusCode::NotConnected, reason);
 }
 
 Status
diff --git a/core/src/sdk/grpc/ClientProxy.h b/core/src/sdk/grpc/ClientProxy.h
index 572b782769..e332266acf 100644
--- a/core/src/sdk/grpc/ClientProxy.h
+++ b/core/src/sdk/grpc/ClientProxy.h
@@ -105,7 +105,7 @@ class ClientProxy : public Connection {
     DropPartition(const PartitionParam& partition_param) override;
 
  private:
-    std::shared_ptr<grpc_channel> channel_;
+    std::shared_ptr<::grpc::Channel> channel_;
 
  private:
     std::shared_ptr<GrpcClient> client_ptr_;