diff --git a/deploy.py b/deploy.py
index f53f712..da84720 100644
--- a/deploy.py
+++ b/deploy.py
@@ -273,7 +273,40 @@ def enable_nginx_site(remote_conf: str, domain: str) -> bool:
 
     target = f"/etc/nginx/sites-enabled/{domain}.conf"
     log_info(f"启用 nginx 站点: {target} -> {remote_conf}")
-    return True  # 后续 Task 替换为完整 5 步实现
+
+    # ===== 步骤 1: 诊断目标路径状态 =====
+    log_info("诊断步骤: 检查目标路径...")
+    diagnose_cmd = (
+        f'test -e {target} && '
+        f'(test -L {target} && echo "symlink" || '
+        f'(test -d {target} && echo "dir" || echo "file")) || '
+        f'echo "missing"'
+    )
+    ok, status, err = ssh_command(diagnose_cmd, timeout=30)
+    if not ok:
+        log_error(f"诊断步骤失败: {err}")
+        return False
+    status = status.strip()
+    log_info(f"诊断结果: {status}")
+
+    # ===== 步骤 2: 清理异常状态 =====
+    log_info("清理步骤: 处理异常状态...")
+    cleanup_cmd = (
+        f'case "{status}" in '
+        f'symlink) unlink {target} ;; '
+        f'dir) rm -rf {target} ;; '
+        f'file) rm -f {target} ;; '
+        f'missing) ;; '
+        f'esac'
+    )
+    ok, _, err = ssh_command(cleanup_cmd, timeout=30)
+    if not ok:
+        log_error(f"清理步骤失败: {err}")
+        log_error("上下文: 目标 = " + target)
+        log_error("提示: 权限可能不足（检查 /etc/nginx/sites-enabled 写权限）")
+        return False
+    log_info("清理步骤完成")
+    return True  # Task 3 替换为完整建链+清默认
 
 
 # ============================================================================