diff --git a/.gitea/workflows/multi-repo-sync.yml b/.gitea/workflows/multi-repo-sync.yml
index 0b1712d..1413231 100644
--- a/.gitea/workflows/multi-repo-sync.yml
+++ b/.gitea/workflows/multi-repo-sync.yml
@@ -44,6 +44,37 @@ jobs:
         fi
         echo "✓ 配置文件已找到"
 
+    - name: 网络连通性诊断
+      run: |
+        echo "================================================================================"
+        echo "网络连通性诊断"
+        echo "================================================================================"
+        echo ""
+        echo "[1] 检查DNS解析 (center.javablade.com):"
+        if command -v nslookup >/dev/null 2>&1; then
+          nslookup center.javablade.com || echo "❌ nslookup 失败"
+        elif command -v dig >/dev/null 2>&1; then
+          dig center.javablade.com || echo "❌ dig 失败"
+        else
+          getent hosts center.javablade.com || echo "❌ DNS 解析失败"
+        fi
+        echo ""
+        echo "[2] 检查网络连通性:"
+        if command -v ping >/dev/null 2>&1; then
+          ping -c 3 -W 5 center.javablade.com || echo "❌ ping 失败"
+        else
+          echo "⚠️  ping 命令不可用，跳过连通性测试"
+        fi
+        echo ""
+        echo "[3] 检查是否可以访问上游仓库（匿名测试）:"
+        if command -v git >/dev/null 2>&1; then
+          timeout 30 git ls-remote https://center.javablade.com/blade/BladeX-Tool.git HEAD || echo "❌ 无法访问仓库"
+        else
+          echo "⚠️  git 命令不可用"
+        fi
+        echo ""
+        echo "================================================================================"
+
     - name: 从配置文件中提取仓库并同步
       env:
         UPSTREAM_USERNAME: ${{ secrets.UPSTREAM_USERNAME }}
diff --git a/sync_repos.py b/sync_repos.py
index ad792c7..689ed20 100644
--- a/sync_repos.py
+++ b/sync_repos.py
@@ -56,13 +56,35 @@ def sync_repository(repo_config):
             return False
         # 获取上游更改
         print(f"[3/6] 获取上游更改...")
-        result = subprocess.run(
-            ['git', 'fetch', 'upstream'],
-            capture_output=True, text=True, timeout=600
-        )
-        if result.returncode != 0:
-            print(f"❌ 获取上游更改失败:")
-            print(result.stderr)
+        max_retries = 3
+        for attempt in range(1, max_retries + 1):
+            try:
+                result = subprocess.run(
+                    ['git', 'fetch', 'upstream'],
+                    capture_output=True, text=True, timeout=200
+                )
+                if result.returncode == 0:
+                    break
+                print(f"❌ 获取上游更改失败 (尝试 {attempt}/{max_retries}):")
+                print(result.stderr)
+            except subprocess.TimeoutExpired:
+                print(f"❌ 获取上游更改超时 (尝试 {attempt}/{max_retries})，200秒限制")
+
+            if attempt < max_retries:
+                print(f"⏳ 等待5秒后重试...")
+                time.sleep(5)
+        else:
+            # 所有尝试都失败
+            print(f"\n网络诊断信息:")
+            print(f"- 错误类型: DNS解析或网络连接失败")
+            print(f"- 可能原因:")
+            print(f"  1. Gitea Actions Runner的DNS配置问题")
+            print(f"  2. Runner容器无法访问外部网络")
+            print(f"  3. 上游仓库服务器防火墙限制")
+            print(f"- 解决方案:")
+            print(f"  1. 在workflow中添加hosts配置")
+            print(f"  2. 检查Runner的网络设置")
+            print(f"  3. 使用IP地址替代域名")
             return False
         # 检查目标分支是否存在
         print(f"[4/6] 检查分支...")