diff --git a/backend/Dockerfile b/backend/Dockerfile
index 692020c..070d9e5 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -6,12 +6,16 @@ ENV GUNICORN_RUNNING=1
 
 WORKDIR /app
 
-RUN apt-get update && apt-get install -y --no-install-recommends \
+# System dependencies (Aliyun mirror for China)
+RUN sed -i 's/deb.debian.org/mirrors.aliyun.com/g' /etc/apt/sources.list.d/debian.sources && \
+    apt-get update && apt-get install -y --no-install-recommends \
     gcc \
     && rm -rf /var/lib/apt/lists/*
 
+# Python dependencies
 COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
+RUN pip config set global.index-url https://mirrors.aliyun.com/pypi/simple/ && \
+    pip install --upgrade pip && pip install --no-cache-dir -r requirements.txt
 
 COPY . .
 
diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index 624bd28..9369eb4 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -2,7 +2,7 @@ FROM node:20-alpine AS build
 
 WORKDIR /app
 COPY package*.json ./
-RUN npm ci
+RUN npm config set registry https://registry.npmmirror.com && npm ci
 COPY . .
 RUN npm run build