diff --git a/src/Qv2rayApplication.cpp b/src/Qv2rayApplication.cpp
index 5fa41412..a9daf2a6 100644
--- a/src/Qv2rayApplication.cpp
+++ b/src/Qv2rayApplication.cpp
@@ -36,10 +36,10 @@ namespace Qv2ray
         hTray = new QSystemTrayIcon();
     }
 
-    void Qv2rayApplication::QuitApplication(int retcode)
+    void Qv2rayApplication::QuitApplication(int retCode)
     {
         isExiting = true;
-        QCoreApplication::exit(retcode);
+        QCoreApplication::exit(retCode);
     }
 
     Qv2rayApplication::Qv2raySetupStatus Qv2rayApplication::SetupQv2ray()
@@ -60,7 +60,7 @@ namespace Qv2ray
         if (isSecondary())
         {
             sendMessage(JsonToString(Qv2rayProcessArgument.toJson(), QJsonDocument::Compact).toUtf8());
-            return SINGLEAPPLICATION;
+            return SINGLE_APPLICATION;
         }
 #endif
 
@@ -182,9 +182,9 @@ namespace Qv2ray
 
     bool Qv2rayApplication::FindAndCreateInitialConfiguration()
     {
-        if (initilized)
+        if (initialized)
         {
-            LOG(MODULE_INIT, "Qv2ray has already been initilized!")
+            LOG(MODULE_INIT, "Qv2ray has already been initialized!")
             return false;
         }
         LOG(MODULE_INIT, "Application exec path: " + applicationDirPath())
@@ -373,7 +373,7 @@ namespace Qv2ray
         return true;
     }
 
-    void Qv2rayApplication::InitilizeGlobalVariables()
+    void Qv2rayApplication::InitializeGlobalVariables()
     {
         StyleManager = new QvStyleManager();
         PluginHost = new QvPluginHost();
@@ -382,7 +382,7 @@ namespace Qv2ray
         StyleManager->ApplyStyle(GlobalConfig.uiConfig.theme);
     }
 
-    bool Qv2rayApplication::PreInitilize(int argc, char *argv[])
+    bool Qv2rayApplication::PreInitialize(int argc, char **argv)
     {
         QString errorMessage;
 
diff --git a/src/Qv2rayApplication.hpp b/src/Qv2rayApplication.hpp
index 8cf8dabf..0efd2c4a 100644
--- a/src/Qv2rayApplication.hpp
+++ b/src/Qv2rayApplication.hpp
@@ -16,7 +16,7 @@ namespace Qv2ray
     {
         QV2RAY_NORMAL = 0,
         QV2RAY_SECONDARY_INSTANCE = 0,
-        QV2RAY_PREINITIALIZE_FAIL = -1,
+        QV2RAY_PRE_INITIALIZE_FAIL = -1,
         QV2RAY_EARLY_SETUP_FAIL = -2,
         QV2RAY_CONFIG_PATH_FAIL = -3,
         QV2RAY_CONFIG_FILE_FAIL = -4,
@@ -63,17 +63,17 @@ namespace Qv2ray
         enum Qv2raySetupStatus
         {
             NORMAL,
-            SINGLEAPPLICATION,
+            SINGLE_APPLICATION,
             FAILED
         };
         //
-        void QuitApplication(int retcode = 0);
-        static bool PreInitilize(int argc, char *argv[]);
+        void QuitApplication(int retCode = 0);
+        static bool PreInitialize(int argc, char **argv);
         explicit Qv2rayApplication(int &argc, char *argv[]);
         Qv2raySetupStatus SetupQv2ray();
         bool FindAndCreateInitialConfiguration();
         bool LoadConfiguration();
-        void InitilizeGlobalVariables();
+        void InitializeGlobalVariables();
         Qv2rayExitCode RunQv2ray();
 
       public:
@@ -98,11 +98,11 @@ namespace Qv2ray
         QSystemTrayIcon *hTray;
         MainWindow *mainWindow;
         static commandline_status ParseCommandLine(QString *errorMessage, const QStringList &args);
-        bool initilized = false;
+        bool initialized = false;
     };
 } // namespace Qv2ray
 
 using namespace Qv2ray;
 
-#define qvApp (static_cast<Qv2ray::Qv2rayApplication *>(QCoreApplication::instance()))
+#define qvApp (dynamic_cast<Qv2ray::Qv2rayApplication *>(QCoreApplication::instance()))
 #define qvAppTrayIcon (*qvApp->GetTrayIcon())
diff --git a/src/main.cpp b/src/main.cpp
index e88a16d8..3abd2d7e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -23,7 +23,7 @@ Qv2rayExitCode RunQv2rayApplicationScoped(int argc, char *argv[])
     switch (setupStatus)
     {
         case Qv2rayApplication::NORMAL: break;
-        case Qv2rayApplication::SINGLEAPPLICATION: return QV2RAY_SECONDARY_INSTANCE;
+        case Qv2rayApplication::SINGLE_APPLICATION: return QV2RAY_SECONDARY_INSTANCE;
         case Qv2rayApplication::FAILED: return QV2RAY_EARLY_SETUP_FAIL;
     }
 
@@ -69,7 +69,7 @@ Qv2rayExitCode RunQv2rayApplicationScoped(int argc, char *argv[])
         return QV2RAY_SSL_FAIL;
     }
 
-    app.InitilizeGlobalVariables();
+    app.InitializeGlobalVariables();
 
 #ifndef Q_OS_WIN
     signal(SIGUSR1, [](int) { ConnectionManager->RestartConnection(); });
@@ -101,8 +101,8 @@ int main(int argc, char *argv[])
 #endif
     //
     // parse the command line before starting as a Qt application
-    if (!Qv2rayApplication::PreInitilize(argc, argv))
-        return QV2RAY_PREINITIALIZE_FAIL;
+    if (!Qv2rayApplication::PreInitialize(argc, argv))
+        return QV2RAY_PRE_INITIALIZE_FAIL;
     const auto rcode = RunQv2rayApplicationScoped(argc, argv);
     if (rcode == QV2RAY_NEW_VERSION)
     {