diff --git a/packages/webpack-uni-mp-loader/lib/plugin/generate-component.js b/packages/webpack-uni-mp-loader/lib/plugin/generate-component.js
index f49deac6252ddc066ea0fd949c582782eeadfdac..e6b0edb7621bd8d4c71b6c0e56c1f9c92b10000d 100644
--- a/packages/webpack-uni-mp-loader/lib/plugin/generate-component.js
+++ b/packages/webpack-uni-mp-loader/lib/plugin/generate-component.js
@@ -294,8 +294,8 @@ module.exports = function generateComponent (compilation, jsonpFunction = 'webpa
   // fix mp-alipay plugin
   if (process.env.UNI_PLATFORM === 'mp-alipay' && appJsonFile) {
     const obj = JSON.parse(appJsonFile.source())
-    if (obj && obj.usingComponents && !Object.keys(obj.usingComponents).length) {
-      const componentName = 'plugin-wrapper'
+    const componentName = 'plugin-wrapper'
+    if (obj && obj.usingComponents && !(componentName in obj.usingComponents)) {
       obj.usingComponents[componentName] = `/${componentName}`
       const source = JSON.stringify(obj, null, 2)
       if (webpack.version[0] > 4) {
diff --git a/packages/webpack-uni-mp-loader/lib/plugin/generate-json.js b/packages/webpack-uni-mp-loader/lib/plugin/generate-json.js
index 2ec810b484e3f6dda471fc30778d545aa05f7df9..f15a9efb369ee21d66e9962167cc4dd931ee81d3 100644
--- a/packages/webpack-uni-mp-loader/lib/plugin/generate-json.js
+++ b/packages/webpack-uni-mp-loader/lib/plugin/generate-json.js
@@ -159,7 +159,7 @@ module.exports = function generateJson (compilation) {
       })
     }
     // fix mp-alipay plugin
-    if (process.env.UNI_PLATFORM === 'mp-alipay') {
+    if (process.env.UNI_PLATFORM === 'mp-alipay' && name !== 'app.json') {
       const usingComponents = jsonObj.usingComponents || {}
       if (Object.values(usingComponents).find(value => value.startsWith('plugin://'))) {
         const componentName = 'plugin-wrapper'