diff --git a/WeaselDeployer/WeaselDeployer.cpp b/WeaselDeployer/WeaselDeployer.cpp
index 4e73af76a..037b674a0 100644
--- a/WeaselDeployer/WeaselDeployer.cpp
+++ b/WeaselDeployer/WeaselDeployer.cpp
@@ -16,17 +16,8 @@ int APIENTRY _tWinMain(HINSTANCE hInstance,
                        int nCmdShow) {
   UNREFERENCED_PARAMETER(hPrevInstance);
 
-  LCID lcid = GetUserDefaultLCID();
-  LANGID langId;
-  if (lcid == 2052 || lcid == 3072 || lcid == 4100) {
-    langId = SetThreadUILanguage(
-        MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED));
-  } else if (lcid == 1028 || lcid == 3076 || lcid == 5124) {
-    langId = SetThreadUILanguage(
-        MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_TRADITIONAL));
-  } else {
-    langId = SetThreadUILanguage(MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US));
-  }
+  LANGID langId = get_language_id();
+  SetThreadUILanguage(langId);
   SetThreadLocale(langId);
 
   HRESULT hRes = ::CoInitialize(NULL);
diff --git a/WeaselServer/WeaselServer.cpp b/WeaselServer/WeaselServer.cpp
index a99b49316..b4cf8b2f1 100644
--- a/WeaselServer/WeaselServer.cpp
+++ b/WeaselServer/WeaselServer.cpp
@@ -22,17 +22,8 @@ int WINAPI _tWinMain(HINSTANCE hInstance,
                      HINSTANCE /*hPrevInstance*/,
                      LPTSTR lpstrCmdLine,
                      int nCmdShow) {
-  LCID lcid = GetUserDefaultLCID();
-  LANGID langId;
-  if (lcid == 2052 || lcid == 3072 || lcid == 4100) {
-    langId = SetThreadUILanguage(
-        MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED));
-  } else if (lcid == 1028 || lcid == 3076 || lcid == 5124) {
-    langId = SetThreadUILanguage(
-        MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_TRADITIONAL));
-  } else {
-    langId = SetThreadUILanguage(MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US));
-  }
+  LANGID langId = get_language_id();
+  SetThreadUILanguage(langId);
   SetThreadLocale(langId);
 
   if (!IsWindowsBlueOrLaterEx()) {
diff --git a/WeaselSetup/WeaselSetup.cpp b/WeaselSetup/WeaselSetup.cpp
index 2a48b04e1..865e4855c 100644
--- a/WeaselSetup/WeaselSetup.cpp
+++ b/WeaselSetup/WeaselSetup.cpp
@@ -4,6 +4,7 @@
 #include "stdafx.h"
 
 #include "resource.h"
+#include "WeaselUtility.h"
 #include <thread>
 
 #include "InstallOptionsDlg.h"
@@ -27,17 +28,8 @@ int WINAPI _tWinMain(HINSTANCE hInstance,
   hRes = _Module.Init(NULL, hInstance);
   ATLASSERT(SUCCEEDED(hRes));
 
-  LCID lcid = GetUserDefaultLCID();
-  LANGID langId;
-  if (lcid == 2052 || lcid == 3072 || lcid == 4100) {
-    langId = SetThreadUILanguage(
-        MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED));
-  } else if (lcid == 1028 || lcid == 3076 || lcid == 5124) {
-    langId = SetThreadUILanguage(
-        MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_TRADITIONAL));
-  } else {
-    langId = SetThreadUILanguage(MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US));
-  }
+  LANGID langId = get_language_id();
+  SetThreadUILanguage(langId);
   SetThreadLocale(langId);
 
   int nRet = Run(lpstrCmdLine);
diff --git a/WeaselTSF/LanguageBar.cpp b/WeaselTSF/LanguageBar.cpp
index 0ff122dfe..7e535e343 100644
--- a/WeaselTSF/LanguageBar.cpp
+++ b/WeaselTSF/LanguageBar.cpp
@@ -155,21 +155,8 @@ static LANGID GetActiveProfileLangId() {
   return profile.langid;
 }
 
-static LANGID GetUserDefaultLangId() {
-  LANGID langId;
-  LCID lcid = GetUserDefaultLCID();
-  if (lcid == 2052 || lcid == 3072 || lcid == 4100) {
-    langId = MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED);
-  } else if (lcid == 1028 || lcid == 3076 || lcid == 5124) {
-    langId = MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_TRADITIONAL);
-  } else {
-    langId = MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US);
-  }
-  return langId;
-}
-
 STDAPI CLangBarItemButton::GetTooltipString(BSTR* pbstrToolTip) {
-  LANGID langid = GetUserDefaultLangId();
+  LANGID langid = get_language_id();
   if (langid == TEXTSERVICE_LANGID_HANS) {
     *pbstrToolTip = SysAllocString(L"左键切换模式，右键打开菜单");
   } else if (langid == TEXTSERVICE_LANGID_HANT) {
@@ -196,7 +183,7 @@ STDAPI CLangBarItemButton::OnClick(TfLBIClick click,
     /* Open menu */
     HWND hwnd = _pTextService->_GetFocusedContextWindow();
     if (hwnd != NULL) {
-      LANGID langid = GetUserDefaultLangId();
+      LANGID langid = get_language_id();
       HMENU menu;
       if (langid == TEXTSERVICE_LANGID_HANS) {
         menu = LoadMenuW(g_hInst, MAKEINTRESOURCE(IDR_MENU_POPUP_HANS));
diff --git a/include/WeaselUtility.h b/include/WeaselUtility.h
index 6fa048a4d..942cd8ab9 100644
--- a/include/WeaselUtility.h
+++ b/include/WeaselUtility.h
@@ -184,11 +184,30 @@ inline std::basic_string<CharT> unescape_string(
 std::string GetCustomResource(const char* name, const char* type);
 
 inline std::wstring get_weasel_ime_name() {
-  LCID lcid = GetUserDefaultLCID();
-  if (lcid == 2052 || lcid == 3072 || lcid == 4100 || lcid == 1028 ||
-      lcid == 3076 || lcid == 5124) {
+  LANGID langId = GetUserDefaultUILanguage();
+
+  if (langId == MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_TRADITIONAL) ||
+      langId == MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED) ||
+      langId == MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_HONGKONG) ||
+      langId == MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SINGAPORE) ||
+      langId == MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_MACAU)) {
     return L"小狼毫";
   } else {
     return L"Weasel";
   }
+}
+
+inline LANGID get_language_id() {
+  LANGID langId = GetUserDefaultUILanguage();
+  if (langId == MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED) ||
+      langId == MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SINGAPORE)) {
+    langId = MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED);
+  } else if (langId == MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_TRADITIONAL) ||
+             langId == MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_HONGKONG) ||
+             langId == MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_MACAU)) {
+    langId = MAKELANGID(LANG_CHINESE, SUBLANG_CHINESE_TRADITIONAL);
+  } else {
+    langId = MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US);
+  }
+  return langId;
 }
\ No newline at end of file