diff --git a/cpp/CHANGELOG.md b/cpp/CHANGELOG.md
index 263f4a787a0cde03db00f4937e8714e232ac217c..489228eca8aae8211890c99b74f08c75d5f38c56 100644
--- a/cpp/CHANGELOG.md
+++ b/cpp/CHANGELOG.md
@@ -16,3 +16,4 @@ Please mark all change in change log and use the ticket from JIRA.
 
 - MS-1 - Add CHANGELOG.md
 - MS-4 - Refactor the vecwise_engine code structure
+- MS-6 - Implement SDK interface part 1
diff --git a/cpp/src/sdk/src/interface/ConnectionImpl.cpp b/cpp/src/sdk/src/interface/ConnectionImpl.cpp
index 26fb5ff209928c49facf5384e726fe772ccad53a..69612ad8b4748a9a667df41068fbd132a6efb0d1 100644
--- a/cpp/src/sdk/src/interface/ConnectionImpl.cpp
+++ b/cpp/src/sdk/src/interface/ConnectionImpl.cpp
@@ -22,59 +22,59 @@ Connection::Destroy(std::shared_ptr<megasearch::Connection> connection_ptr) {
 
 //////////////////////////////////////////////////////////////////////////////////////////////
 ConnectionImpl::ConnectionImpl() {
-    client_proxy = std::make_shared<ClientProxy>();
+    client_proxy_ = std::make_shared<ClientProxy>();
 }
 
 Status
 ConnectionImpl::Connect(const ConnectParam &param) {
-    return client_proxy->Connect(param);
+    return client_proxy_->Connect(param);
 }
 
 Status
 ConnectionImpl::Connect(const std::string &uri) {
-    return client_proxy->Connect(uri);
+    return client_proxy_->Connect(uri);
 }
 
 Status
 ConnectionImpl::Connected() const {
-    return client_proxy->Connected();
+    return client_proxy_->Connected();
 }
 
 Status
 ConnectionImpl::Disconnect() {
-    return client_proxy->Disconnect();
+    return client_proxy_->Disconnect();
 }
 
 std::string
 ConnectionImpl::ClientVersion() const {
-    return client_proxy->ClientVersion();
+    return client_proxy_->ClientVersion();
 }
 
 Status
 ConnectionImpl::CreateTable(const TableSchema &param) {
-    return client_proxy->CreateTable(param);
+    return client_proxy_->CreateTable(param);
 }
 
 Status
 ConnectionImpl::CreateTablePartition(const CreateTablePartitionParam &param) {
-    return client_proxy->CreateTablePartition(param);
+    return client_proxy_->CreateTablePartition(param);
 }
 
 Status
 ConnectionImpl::DeleteTablePartition(const DeleteTablePartitionParam &param) {
-    return client_proxy->DeleteTablePartition(param);
+    return client_proxy_->DeleteTablePartition(param);
 }
 
 Status
 ConnectionImpl::DeleteTable(const std::string &table_name) {
-    return client_proxy->DeleteTable(table_name);
+    return client_proxy_->DeleteTable(table_name);
 }
 
 Status
 ConnectionImpl::AddVector(const std::string &table_name,
                           const std::vector<RowRecord> &record_array,
                           std::vector<int64_t> &id_array) {
-    return client_proxy->AddVector(table_name, record_array, id_array);
+    return client_proxy_->AddVector(table_name, record_array, id_array);
 }
 
 Status
@@ -82,27 +82,27 @@ ConnectionImpl::SearchVector(const std::string &table_name,
                              const std::vector<QueryRecord> &query_record_array,
                              std::vector<TopKQueryResult> &topk_query_result_array,
                              int64_t topk) {
-    return client_proxy->SearchVector(table_name, query_record_array, topk_query_result_array, topk);
+    return client_proxy_->SearchVector(table_name, query_record_array, topk_query_result_array, topk);
 }
 
 Status
 ConnectionImpl::DescribeTable(const std::string &table_name, TableSchema &table_schema) {
-    return client_proxy->DescribeTable(table_name, table_schema);
+    return client_proxy_->DescribeTable(table_name, table_schema);
 }
 
 Status
 ConnectionImpl::ShowTables(std::vector<std::string> &table_array) {
-    return client_proxy->ShowTables(table_array);
+    return client_proxy_->ShowTables(table_array);
 }
 
 std::string
 ConnectionImpl::ServerVersion() const {
-    return client_proxy->ServerVersion();
+    return client_proxy_->ServerVersion();
 }
 
 std::string
 ConnectionImpl::ServerStatus() const {
-    return client_proxy->ServerStatus();
+    return client_proxy_->ServerStatus();
 }
 
 }
diff --git a/cpp/src/sdk/src/interface/ConnectionImpl.h b/cpp/src/sdk/src/interface/ConnectionImpl.h
index 624bbebde55032b35ec668b9971dbf2fa58c91c3..0c67ea3f4259c53d99f7fd4a09197c8b53932693 100644
--- a/cpp/src/sdk/src/interface/ConnectionImpl.h
+++ b/cpp/src/sdk/src/interface/ConnectionImpl.h
@@ -51,7 +51,7 @@ public:
     virtual std::string ServerStatus() const override;
 
 private:
-    std::shared_ptr<ClientProxy> client_proxy;
+    std::shared_ptr<ClientProxy> client_proxy_;
 };
     
 }
diff --git a/cpp/src/sdk/src/util/ConvertUtil.cpp b/cpp/src/sdk/src/util/ConvertUtil.cpp
index 90cab3fdb42cfcae26b640b4702c136a9dc095a3..577f5de446abdb37d1397e71e80dd30c00c48f7a 100644
--- a/cpp/src/sdk/src/util/ConvertUtil.cpp
+++ b/cpp/src/sdk/src/util/ConvertUtil.cpp
@@ -4,6 +4,7 @@
  * Proprietary and confidential.
  ******************************************************************************/
 #include "ConvertUtil.h"
+#include "Exception.h"
 
 #include <map>
 
@@ -20,7 +21,7 @@ std::string ConvertUtil::IndexType2Str(megasearch::IndexType index) {
 
     const auto& iter = s_index2str.find(index);
     if(iter == s_index2str.end()) {
-        return INDEX_RAW;
+        throw Exception(StatusCode::Invalid, "Invalid index type");
     }
 
     return iter->second;
@@ -34,7 +35,7 @@ megasearch::IndexType ConvertUtil::Str2IndexType(const std::string& type) {
 
     const auto& iter = s_str2index.find(type);
     if(iter == s_str2index.end()) {
-        return megasearch::IndexType::raw;
+        throw Exception(StatusCode::Invalid, "Invalid index type");
     }
 
     return iter->second;
diff --git a/cpp/src/sdk/src/util/Exception.h b/cpp/src/sdk/src/util/Exception.h
new file mode 100644
index 0000000000000000000000000000000000000000..7e31b182a6f7de540884cbfa87dd07669a79828b
--- /dev/null
+++ b/cpp/src/sdk/src/util/Exception.h
@@ -0,0 +1,32 @@
+/*******************************************************************************
+ * Copyright 上海赜睿信息科技有限公司(Zilliz) - All Rights Reserved
+ * Unauthorized copying of this file, via any medium is strictly prohibited.
+ * Proprietary and confidential.
+ ******************************************************************************/
+#pragma once
+
+#include "Status.h"
+
+#include <exception>
+
+namespace megasearch {
+class Exception : public std::exception {
+public:
+    Exception(StatusCode error_code,
+            const std::string &message = std::string())
+        : error_code_(error_code), message_(message) {}
+
+public:
+    StatusCode error_code() const {
+        return error_code_;
+    }
+
+    virtual const char *what() const noexcept {
+        return message_.c_str();
+    }
+
+private:
+    StatusCode error_code_;
+    std::string message_;
+};
+}
\ No newline at end of file