diff --git a/sync-server/Dockerfile b/sync-server/Dockerfile
index f535dcc..eaede11 100644
--- a/sync-server/Dockerfile
+++ b/sync-server/Dockerfile
@@ -1,4 +1,7 @@
-FROM node:24-alpine
+# 基础镜像可通过 build-arg 替换为镜像源，例如：
+#   docker compose build --build-arg NODE_IMAGE=docker.m.daocloud.io/library/node:24-alpine
+ARG NODE_IMAGE=node:24-alpine
+FROM ${NODE_IMAGE}
 
 WORKDIR /app