diff --git a/Dockerfile b/Dockerfile
index 6a60c42..8cb1933 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,6 @@
 # BuildFlow API (.NET 10) 多阶段构建
-FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+# base 镜像走 Harbor Proxy Cache（mcr-proxy → mcr.microsoft.com），避免公网拉取超时
+FROM 43.134.235.58:58080/mcr-proxy/dotnet/sdk:10.0 AS build
 WORKDIR /src
 
 # 先拷贝 sln 和 props,利用层缓存恢复 NuGet
@@ -10,7 +11,7 @@ COPY src/ ./src/
 RUN dotnet publish src/BuildFlow.Host/BuildFlow.Host.csproj -c Release -o /app/publish /p:UseAppHost=false
 
 # 运行时镜像
-FROM mcr.microsoft.com/dotnet/aspnet:10.0
+FROM 43.134.235.58:58080/mcr-proxy/dotnet/aspnet:10.0
 WORKDIR /app
 COPY --from=build /app/publish ./