diff --git a/packages/uni-api/src/service/base/upx2px.ts b/packages/uni-api/src/service/base/upx2px.ts
index 62505502cab..1e39cdd1c5f 100644
--- a/packages/uni-api/src/service/base/upx2px.ts
+++ b/packages/uni-api/src/service/base/upx2px.ts
@@ -16,7 +16,13 @@ let baseWidth = 375
 let includeWidth = 750
 
 function checkDeviceWidth() {
-  const { platform, pixelRatio, windowWidth } = getBaseSystemInfo()
+  const { windowWidth, pixelRatio, platform } =
+    __PLATFORM__ === 'mp-weixin'
+      ? Object.assign({}, wx.getWindowInfo(), {
+          platform: wx.getDeviceInfo().platform,
+        })
+      : getBaseSystemInfo()
+
   deviceWidth = windowWidth as number
   deviceDPR = pixelRatio as number
   isIOS = (platform as string) === 'ios'
diff --git a/packages/uni-mp-core/src/api/locale.ts b/packages/uni-mp-core/src/api/locale.ts
index 3009799d6a7..722828f19a5 100644
--- a/packages/uni-mp-core/src/api/locale.ts
+++ b/packages/uni-mp-core/src/api/locale.ts
@@ -7,7 +7,9 @@ export const getLocale: typeof uni.getLocale = () => {
   if (app && app.$vm) {
     return app.$vm.$locale
   }
-  return normalizeLocale(__GLOBAL__.getSystemInfoSync().language) || LOCALE_EN
+  return __PLATFORM__ === 'mp-weixin'
+    ? normalizeLocale(__GLOBAL__.getAppBaseInfo().language) || LOCALE_EN
+    : normalizeLocale(__GLOBAL__.getSystemInfoSync().language) || LOCALE_EN
 }
 
 export const setLocale: typeof uni.setLocale = (locale) => {
diff --git a/packages/uni-mp-core/src/runtime/app.ts b/packages/uni-mp-core/src/runtime/app.ts
index 95f4d060fef..dc17bebf73b 100644
--- a/packages/uni-mp-core/src/runtime/app.ts
+++ b/packages/uni-mp-core/src/runtime/app.ts
@@ -164,7 +164,9 @@ export function initAppLifecycle(
 
 function initLocale(appVm: ComponentPublicInstance) {
   const locale = ref<string>(
-    normalizeLocale(__GLOBAL__.getSystemInfoSync().language) || LOCALE_EN
+    __PLATFORM__ === 'mp-weixin'
+      ? normalizeLocale(__GLOBAL__.getAppBaseInfo().language) || LOCALE_EN
+      : normalizeLocale(__GLOBAL__.getSystemInfoSync().language) || LOCALE_EN
   )
   Object.defineProperty(appVm, '$locale', {
     get() {