diff --git a/.gitea/workflows/deploy-client.yml b/.gitea/workflows/deploy-client.yml
index 8ba9cf7..d9319f8 100644
--- a/.gitea/workflows/deploy-client.yml
+++ b/.gitea/workflows/deploy-client.yml
@@ -39,6 +39,9 @@ jobs:
       GOPROXY: https://goproxy.cn,direct
       PUB_HOSTED_URL: https://pub.flutter-io.cn
       FLUTTER_STORAGE_BASE_URL: https://storage.flutter-io.cn
+      # sing-box 源码经 NAS gitea 镜像取(mac runner 连不上 github;经 runner 的
+      # gitea relay 127.0.0.1:13000 → wangjia/sing-box)。见 scripts/build-libbox.sh。
+      SINGBOX_GIT: http://127.0.0.1:13000/wangjia/sing-box.git
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/scripts/build-libbox.sh b/scripts/build-libbox.sh
index b421a21..1803071 100644
--- a/scripts/build-libbox.sh
+++ b/scripts/build-libbox.sh
@@ -54,7 +54,10 @@ gomobile init
 echo "==> [2/3] 拉 sing-box $SINGBOX_VERSION 源码"
 mkdir -p "$WORK"
 rm -rf "$WORK/sing-box"
-git clone --depth 1 --branch "$SINGBOX_VERSION" https://github.com/SagerNet/sing-box.git "$WORK/sing-box"
+# sing-box 源码:默认 github,CI 里国内 runner 连不上 github → 经 SINGBOX_GIT 指向
+# NAS gitea 镜像(wangjia/sing-box,gitea migrate 自 github)。见 deploy-client.yml。
+SINGBOX_GIT="${SINGBOX_GIT:-https://github.com/SagerNet/sing-box.git}"
+git clone --depth 1 --branch "$SINGBOX_VERSION" "$SINGBOX_GIT" "$WORK/sing-box"
 cd "$WORK/sing-box"
 
 echo "==> [3/3] 用官方 build_libbox 编核心库"