diff --git a/backend/Dockerfile b/backend/Dockerfile
index 19138c5..4ec3608 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -8,6 +8,10 @@ COPY package*.json ./
 
 # 安装所有依赖 (包括开发依赖)
 RUN npm ci
+# 设置时区
+RUN apk add --no-cache tzdata \
+ && cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
+ && echo "Asia/Shanghai" > /etc/timezone
 
 # 复制源代码
 COPY . .