diff --git a/core/include/alibabacloud/core/Utils.h b/core/include/alibabacloud/core/Utils.h
index 190f15838..82dca4078 100644
--- a/core/include/alibabacloud/core/Utils.h
+++ b/core/include/alibabacloud/core/Utils.h
@@ -36,7 +36,6 @@ std::string
 canonicalizedQuery(const std::map<std::string, std::string> &params);
 std::string canonicalizedHeaders(const HttpMessage::HeaderCollection &headers);
 std::string GetEnv(const std::string env);
-Json::Value ReadJson(const std::string str);
 std::string MapToJson(const std::map<std::string, std::string> &maps);
 std::map<std::string, std::string> JsonToMap(const std::string &json);
 } // namespace AlibabaCloud
diff --git a/core/src/Utils.cc b/core/src/Utils.cc
index a252acef3..1402189f3 100644
--- a/core/src/Utils.cc
+++ b/core/src/Utils.cc
@@ -203,22 +203,6 @@ std::string AlibabaCloud::canonicalizedHeaders(
   return ss.str();
 }
 
-Json::Value AlibabaCloud::ReadJson(const std::string str)
-{
-  Json::CharReaderBuilder builder;
-  Json::CharReader *reader = builder.newCharReader();
-  Json::Value *val;
-  Json::Value value;
-  JSONCPP_STRING *errs;
-  reader->parse(str.data(), str.data() + str.size(), val, errs);
-  if (errs == NULL)
-  {
-    value = *val;
-    return value;
-  }
-  throw errs;
-}
-
 std::string AlibabaCloud::GetEnv(const std::string env)
 {
 #ifdef _WIN32