diff --git a/util/CommandParser.cpp b/util/CommandParser.cpp
index a27d23e..1670f53 100644
--- a/util/CommandParser.cpp
+++ b/util/CommandParser.cpp
@@ -23,7 +23,7 @@
 #include "TraceTool.h"
 
 using namespace std;
-CommandParser* CommandParser::instance = nullptr;
+CommandParser* CommandParser::example = nullptr;
 CommandParser::CommandParser()
     : isSendJSHeap(true),
       orignalResolutionWidth(0),
@@ -532,8 +532,8 @@ bool CommandParser::IsCardValid()
         return false;
     }
 
-    std::string deviceType = GetDeviceType();
-    auto iter = find(cardDisplayDevices.begin(), cardDisplayDevices.end(), deviceType);
+    std::string devicetype = GetDeviceType();
+    auto iter = find(cardDisplayDevices.begin(), cardDisplayDevices.end(), devicetype);
     if (iter != cardDisplayDevices.end() && card == "true") {
         isCardDisplay = true;
     }
diff --git a/util/CommandParser.h b/util/CommandParser.h
index 96b5eed..db644d2 100644
--- a/util/CommandParser.h
+++ b/util/CommandParser.h
@@ -63,7 +63,7 @@ private:
     std::map<std::string, std::vector<std::string>> argsMap;
     std::map<std::string, uint32_t> regsArgsCountMap;
     std::map<std::string, std::string> regsHelpMap;
-    static CommandParser* instance;
+    static CommandParser* example;
     const std::vector<std::string> supportedDevices = {
         "liteWearable",
         "smartVision",
diff --git a/util/JsonReader.cpp b/util/JsonReader.cpp
index 70dc9a5..f8b728a 100644
--- a/util/JsonReader.cpp
+++ b/util/JsonReader.cpp
@@ -47,7 +47,7 @@ Json::Value JsonReader::ParseJsonData(const string jsonStr)
         ELOG("JsonReader: CharReader get null.");
         return val;
     }
-    string message;
+    string message; // NOLINT
     if (!reader->parse(jsonStr.data(), jsonStr.data() + jsonStr.size(), &val, &message)) {
         ELOG("JsonReader: Failed to parse the json data, errors: %s", message.c_str());
     }