diff --git a/infra/docker/web.Dockerfile b/infra/docker/web.Dockerfile
index f800ed684..12fe02505 100755
--- a/infra/docker/web.Dockerfile
+++ b/infra/docker/web.Dockerfile
@@ -8,10 +8,9 @@ ENV VITE_API_URL=$VITE_API_URL
 COPY apps/web/package.json apps/web/package-lock.json ./apps/web/
 WORKDIR /app/apps/web
 
-# 安装依赖：用BuildKit cache mount缓存npm下载和node_modules
-# sharing=locked 防止并发构建竞争写缓存
+# 安装依赖：node_modules写入镜像layer，走ACR缓存保证完整性
+# /root/.npm 保留cache mount加速下载（不影响构建正确性）
 RUN --mount=type=cache,target=/root/.npm,sharing=locked \
-    --mount=type=cache,target=/app/apps/web/node_modules,sharing=locked \
     npm config set registry https://registry.npmmirror.com \
     && npm ci
 
@@ -19,8 +18,8 @@ RUN --mount=type=cache,target=/root/.npm,sharing=locked \
 COPY apps/web/ ./
 
 # 构建：TS增量编译 + Vite构建，tsbuildinfo用cache mount持久化
-RUN --mount=type=cache,target=/app/apps/web/node_modules,sharing=locked \
-    --mount=type=cache,target=/app/apps/web/.tscache,sharing=locked \
+# node_modules直接使用镜像中已安装的（layer缓存保证完整性）
+RUN --mount=type=cache,target=/app/apps/web/.tscache,sharing=locked \
     mkdir -p .tscache \
     && npx tsc --incremental --tsBuildInfoFile .tscache/tsconfig.tsbuildinfo \
     && npx vite build