diff --git a/packages/taro-mini-runner/src/webpack/chain.ts b/packages/taro-mini-runner/src/webpack/chain.ts
index 6e601cd18121..ebe2e053fb8e 100644
--- a/packages/taro-mini-runner/src/webpack/chain.ts
+++ b/packages/taro-mini-runner/src/webpack/chain.ts
@@ -257,7 +257,8 @@ export const getModule = (appPath: string, {
   ])
   const sassLoader = getSassLoader([{
     sourceMap: true,
-    implementation: sass
+    implementation: sass,
+    outputStyle: 'expanded'
   }, sassLoaderOption])
   const lessLoader = getLessLoader([{ sourceMap: enableSourceMap }, lessLoaderOption])