diff --git a/Dockerfile b/Dockerfile
index d94180c..7511f3a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,12 @@
+# syntax=docker/dockerfile:1.7
 # ===== 阶段1: 构建前端 =====
 FROM node:20-slim AS frontend-builder
 
 WORKDIR /build
 COPY web/frontend/package.json web/frontend/package-lock.json* ./
-# 优先 npmmirror，失败时回退官方 registry
-RUN npm config set registry https://registry.npmmirror.com && \
+# npm 缓存挂载：即使镜像层缓存失效，也复用已下载的包，避免每次部署都重新拉依赖。
+RUN --mount=type=cache,target=/root/.npm \
+    npm config set registry https://registry.npmmirror.com && \
     (npm ci || npm install) || \
     (npm config set registry https://registry.npmjs.org && (npm ci || npm install))
 COPY web/frontend/ ./
@@ -16,7 +18,8 @@ FROM node:20-slim AS yyb-node-builder
 WORKDIR /build
 COPY services/yyb-worker/package.json services/yyb-worker/package-lock.json ./
 # 优先 npmmirror，失败时回退官方 registry，避免国内构建时依赖下载中断。
-RUN npm config set registry https://registry.npmmirror.com && \
+RUN --mount=type=cache,target=/root/.npm \
+    npm config set registry https://registry.npmmirror.com && \
     npm ci --omit=dev || \
     (npm config set registry https://registry.npmjs.org && npm ci --omit=dev)
 
@@ -26,7 +29,10 @@ FROM python:3.12-slim AS runtime
 ARG USE_CHINA_MIRRORS=true
 
 # 服务器默认使用阿里云镜像；本地构建可设 USE_CHINA_MIRRORS=false 直连官方源。
-RUN if [ "$USE_CHINA_MIRRORS" = "true" ]; then \
+# apt 缓存挂载：包索引和 .deb 都留在 BuildKit 缓存里，不再每次重下。
+RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
+    --mount=type=cache,target=/var/lib/apt,sharing=locked \
+    if [ "$USE_CHINA_MIRRORS" = "true" ]; then \
         cp /etc/apt/sources.list.d/debian.sources /tmp/debian.sources && \
         sed -i 's/deb.debian.org/mirrors.cloud.aliyuncs.com/g' /etc/apt/sources.list.d/debian.sources && \
         (apt-get update -o APT::Update::Error-Mode=any || \
@@ -41,11 +47,11 @@ RUN if [ "$USE_CHINA_MIRRORS" = "true" ]; then \
     libgl1 \
     libglib2.0-0 \
     nodejs \
-    fonts-wqy-microhei \
-    && rm -rf /var/lib/apt/lists/*
+    fonts-wqy-microhei
 
 # 安装 uv：服务器走阿里云镜像，本地直连官方 PyPI。
-RUN if [ "$USE_CHINA_MIRRORS" = "true" ]; then \
+RUN --mount=type=cache,target=/root/.cache/pip \
+    if [ "$USE_CHINA_MIRRORS" = "true" ]; then \
         pip install -i https://mirrors.cloud.aliyuncs.com/pypi/simple/ uv || \
         pip install -i https://mirrors.aliyun.com/pypi/simple/ uv || \
         pip install uv; \
@@ -57,7 +63,8 @@ WORKDIR /app
 
 # 先复制依赖文件，利用 Docker 缓存层
 COPY pyproject.toml uv.lock* README.md alembic.ini ./
-RUN uv venv /app/.venv && \
+RUN --mount=type=cache,target=/root/.cache/uv \
+    uv venv /app/.venv && \
     if [ "$USE_CHINA_MIRRORS" = "true" ]; then \
         (UV_INDEX_URL=https://mirrors.cloud.aliyuncs.com/pypi/simple/ uv pip install -e . || \
          UV_INDEX_URL=https://mirrors.aliyun.com/pypi/simple/ uv pip install -e . || \
@@ -108,7 +115,8 @@ FROM runtime AS test
 ARG USE_CHINA_MIRRORS=true
 COPY tests/ ./tests/
 COPY conftest.py ./
-RUN if [ "$USE_CHINA_MIRRORS" = "true" ]; then \
+RUN --mount=type=cache,target=/root/.cache/uv \
+    if [ "$USE_CHINA_MIRRORS" = "true" ]; then \
         (UV_INDEX_URL=https://mirrors.cloud.aliyuncs.com/pypi/simple/ uv sync --frozen --group dev || \
          UV_INDEX_URL=https://mirrors.aliyun.com/pypi/simple/ uv sync --frozen --group dev || \
          uv sync --frozen --group dev); \