diff --git a/packages/taro-cli/src/util/resolve_npm_files.js b/packages/taro-cli/src/util/resolve_npm_files.js
index 40d5b3c7af01..b7f06688103d 100644
--- a/packages/taro-cli/src/util/resolve_npm_files.js
+++ b/packages/taro-cli/src/util/resolve_npm_files.js
@@ -39,7 +39,7 @@ const projectConfig = require(configDir)(_.merge)
 const pluginsConfig = projectConfig.plugins || {}
 const outputDirName = projectConfig.outputRoot || CONFIG.OUTPUT_DIR
 
-const babelConfig = _.mergeWith(defaultBabelConfig, pluginsConfig.babel, (objValue, srcValue) => {
+const babelConfig = _.mergeWith({}, defaultBabelConfig, pluginsConfig.babel, (objValue, srcValue) => {
   if (Array.isArray(objValue)) {
     return Array.from(new Set(srcValue.concat(objValue)))
   }
diff --git a/packages/taro-cli/src/weapp.js b/packages/taro-cli/src/weapp.js
index f4c6cb774ecc..a5b4e7376f7c 100644
--- a/packages/taro-cli/src/weapp.js
+++ b/packages/taro-cli/src/weapp.js
@@ -949,7 +949,7 @@ function copyFilesFromSrcToOutput (files) {
   })
 }
 
-const babelConfig = _.mergeWith(defaultBabelConfig, pluginsConfig.babel, (objValue, srcValue) => {
+const babelConfig = _.mergeWith({}, defaultBabelConfig, pluginsConfig.babel, (objValue, srcValue) => {
   if (Array.isArray(objValue)) {
     return Array.from(new Set(srcValue.concat(objValue)))
   }