diff --git a/packages/core/logger/src/request-logger.ts b/packages/core/logger/src/request-logger.ts
index fc6e78a401..39efbc490e 100644
--- a/packages/core/logger/src/request-logger.ts
+++ b/packages/core/logger/src/request-logger.ts
@@ -71,6 +71,7 @@ export const requestLogger = (appName: string, requestLogger: Logger, options?:
         cost,
         app: appName,
         reqId,
+        bodySize: ctx.response.length,
       };
       if (Math.floor(status / 100) == 5) {
         requestLogger.error({ ...info, res: ctx.body?.['errors'] || ctx.body });