diff --git a/src/main/tool-handlers-system.ts b/src/main/tool-handlers-system.ts
index 3207da1..afc3af0 100644
--- a/src/main/tool-handlers-system.ts
+++ b/src/main/tool-handlers-system.ts
@@ -446,7 +446,10 @@ async function handleWebSearchSearxng(
   timeRange: string,
   _enhanceSnippets: boolean
 ): Promise<ToolResult> {
-  const url = getSetting<string>('searxng_url', 'https://search.metona.cn');
+  const url = getSetting<string>('searxng_url', '');
+  if (!url) {
+    return { success: false, error: 'SearXNG API 地址未配置。请在 SearXNG 设置中填写 API 地址。' };
+  }
   const engines = getSetting<string>('searxng_engines', 'google,bing,duckduckgo,wikipedia');
   const language = getSetting<string>('searxng_language', 'zh-CN');
   const safesearch = getSetting<number>('searxng_safesearch', 1);
diff --git a/src/renderer/components/searxng-modal.ts b/src/renderer/components/searxng-modal.ts
index 03a30af..1e4fc5c 100644
--- a/src/renderer/components/searxng-modal.ts
+++ b/src/renderer/components/searxng-modal.ts
@@ -10,7 +10,7 @@ import { logInfo, logSuccess } from '../services/log-service.js';
 /** 默认 SearXNG 配置 */
 const DEFAULTS = {
   enabled: false,
-  url: 'https://search.metona.cn',
+  url: '',
   engines: 'google,bing,duckduckgo,wikipedia',
   language: 'zh-CN',
   safesearch: 1,
@@ -113,7 +113,19 @@ export function initSearxngModal(): void {
 
   // ── 保存按钮 ──
   document.querySelector('#btnSaveSearxng')!.addEventListener('click', async () => {
-    searxngConfig.url = (document.querySelector('#searxngUrl') as HTMLInputElement).value.trim();
+    const url = (document.querySelector('#searxngUrl') as HTMLInputElement).value.trim();
+    if (!url) {
+      const { showToast } = await import('./toast.js');
+      showToast('SearXNG API 地址不能为空', 'error');
+      return;
+    }
+    if (!/^https?:\/\/.+/.test(url)) {
+      const { showToast } = await import('./toast.js');
+      showToast('SearXNG API 地址格式不正确，需以 http:// 或 https:// 开头', 'error');
+      return;
+    }
+
+    searxngConfig.url = url;
     searxngConfig.engines = (document.querySelector('#searxngEngines') as HTMLInputElement).value.trim();
     searxngConfig.language = (document.querySelector('#searxngLanguage') as HTMLSelectElement).value;
     searxngConfig.safesearch = parseInt((document.querySelector('#searxngSafeSearch') as HTMLSelectElement).value);
diff --git a/src/renderer/index.html b/src/renderer/index.html
index 01d2a24..f0c6105 100644
--- a/src/renderer/index.html
+++ b/src/renderer/index.html
@@ -732,7 +732,7 @@
 
             <div class="setting-group">
                 <label class="setting-label">SearXNG API 地址</label>
-                <input class="setting-input" id="searxngUrl" type="url" placeholder="https://search.metona.cn" style="margin-bottom:6px;">
+                <input class="setting-input" id="searxngUrl" type="url" placeholder="https://search.metona.cn" required style="margin-bottom:6px;">
                 <p class="text-muted" style="font-size:11px;">SearXNG 实例的根地址，无需带 /search 路径</p>
             </div>