diff --git a/webapp/static/css/app.css b/webapp/static/css/app.css
index 645b1dd..1499d0e 100644
--- a/webapp/static/css/app.css
+++ b/webapp/static/css/app.css
@@ -294,6 +294,21 @@ table.group-table td { border-bottom: 1px solid #f1f5f9; font-variant-numeric: t
 .btn-sm { padding: 4px 10px; font-size: 12px; }
 .btn-danger { color: var(--bad); border-color: var(--bad); }
 .btn-danger:hover { background: #fee2e2; }
+.btn-test { color: #0369a1; border-color: #0369a1; }
+.btn-test:hover { background: #e0f2fe; }
+
+/* LLM 连通性测试结果 */
+.profile-test-result {
+  margin-top: 8px;
+  padding: 6px 10px;
+  border-radius: 6px;
+  font-size: 12px;
+  font-weight: 500;
+  display: none;
+}
+.profile-test-result:not([hidden]) { display: block; }
+.profile-test-result.ok  { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
+.profile-test-result.fail { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; word-break: break-all; }
 
 /* 选中态 run 卡片 */
 .run-card.selected {
diff --git a/webapp/static/index.html b/webapp/static/index.html
index d7a2d57..a262c55 100644
--- a/webapp/static/index.html
+++ b/webapp/static/index.html
@@ -219,9 +219,11 @@
             </div>
             <div class="form-actions">
               <button class="btn btn-primary" id="save-profile-btn">保存</button>
+              <button class="btn btn-test" id="test-profile-btn">测试连通性</button>
               <button class="btn" id="cancel-profile-btn">取消</button>
               <span class="form-error muted" id="profile-form-error"></span>
             </div>
+            <div class="profile-test-result" id="profile-form-test-result" hidden></div>
           </div>
         </div>
 
diff --git a/webapp/static/js/api.js b/webapp/static/js/api.js
index caa4f15..26f7e14 100644
--- a/webapp/static/js/api.js
+++ b/webapp/static/js/api.js
@@ -65,4 +65,16 @@ const API = {
       });
   },
   applyProfiles(body) { return API.post("/api/llm-profiles/apply", body); },
+
+  // 测试已保存 profile 的连通性
+  testProfile(id) {
+    return fetch(`/api/llm-profiles/${encodeURIComponent(id)}/test`, { method: "POST" })
+      .then(async r => {
+        if (!r.ok) { const d = await API._extractError(r); throw new Error(d); }
+        return r.json();
+      });
+  },
+
+  // 测试表单中填写的内联参数（保存前即可测试）
+  probeConnectivity(body) { return API.post("/api/llm-profiles/probe", body); },
 };
diff --git a/webapp/static/js/profiles.js b/webapp/static/js/profiles.js
index 83e5a53..4355b09 100644
--- a/webapp/static/js/profiles.js
+++ b/webapp/static/js/profiles.js
@@ -8,6 +8,7 @@ const Profiles = {
     document.getElementById("add-profile-btn").addEventListener("click", () => Profiles.showForm());
     document.getElementById("save-profile-btn").addEventListener("click", () => Profiles.save());
     document.getElementById("cancel-profile-btn").addEventListener("click", () => Profiles.hideForm());
+    document.getElementById("test-profile-btn").addEventListener("click", () => Profiles.testForm());
   },
 
   // 加载并渲染 Profile 列表
@@ -39,6 +40,7 @@ const Profiles = {
       <div class="profile-card-head">
         <div class="profile-card-name">${App.escape(p.name)}</div>
         <div class="profile-card-actions">
+          <button class="btn btn-sm btn-test" data-action="test">测试</button>
           <button class="btn btn-sm" data-action="edit">编辑</button>
           <button class="btn btn-sm btn-danger" data-action="delete">删除</button>
         </div>
@@ -46,12 +48,72 @@ const Profiles = {
       <div class="profile-card-field"><span class="field-label">模型</span> <code>${App.escape(p.model)}</code></div>
       <div class="profile-card-field"><span class="field-label">Base URL</span> <code>${App.escape(p.base_url)}</code></div>
       <div class="profile-card-field"><span class="field-label">超时</span> ${p.timeout_seconds}s</div>
+      <div class="profile-test-result" data-result hidden></div>
     `;
+    card.querySelector("[data-action=test]").addEventListener("click", () => Profiles.testCard(p, card));
     card.querySelector("[data-action=edit]").addEventListener("click", () => Profiles.showForm(p));
     card.querySelector("[data-action=delete]").addEventListener("click", () => Profiles.remove(p.profile_id, p.name));
     return card;
   },
 
+  // 测试已保存的 profile（卡片上的测试按钮）
+  async testCard(p, card) {
+    const btn = card.querySelector("[data-action=test]");
+    const resultEl = card.querySelector("[data-result]");
+    btn.disabled = true;
+    btn.textContent = "测试中…";
+    resultEl.hidden = true;
+    resultEl.className = "profile-test-result";
+    try {
+      const res = await API.testProfile(p.profile_id);
+      Profiles._showTestResult(resultEl, res);
+    } catch (err) {
+      Profiles._showTestResult(resultEl, { ok: false, message: err.message });
+    } finally {
+      btn.disabled = false;
+      btn.textContent = "测试";
+    }
+  },
+
+  // 测试表单中当前填写的参数（保存前即可测试）
+  async testForm() {
+    const body = {
+      model: document.getElementById("pf-model").value.trim(),
+      base_url: document.getElementById("pf-base-url").value.trim(),
+      api_key: document.getElementById("pf-api-key").value.trim(),
+      timeout_seconds: parseInt(document.getElementById("pf-timeout").value, 10) || 30,
+    };
+    const errEl = document.getElementById("profile-form-error");
+    if (!body.model || !body.base_url || !body.api_key) {
+      errEl.textContent = "请先填写模型名称、Base URL 和 API Key";
+      return;
+    }
+    errEl.textContent = "";
+    const testBtn = document.getElementById("test-profile-btn");
+    const resultEl = document.getElementById("profile-form-test-result");
+    testBtn.disabled = true;
+    testBtn.textContent = "测试中…";
+    resultEl.hidden = true;
+    resultEl.className = "profile-test-result";
+    try {
+      const res = await API.probeConnectivity(body);
+      Profiles._showTestResult(resultEl, res);
+    } catch (err) {
+      Profiles._showTestResult(resultEl, { ok: false, message: err.message });
+    } finally {
+      testBtn.disabled = false;
+      testBtn.textContent = "测试连通性";
+    }
+  },
+
+  // 渲染测试结果到指定元素
+  _showTestResult(el, res) {
+    el.hidden = false;
+    el.classList.add(res.ok ? "ok" : "fail");
+    const latency = res.latency_ms != null ? ` (${res.latency_ms}ms)` : "";
+    el.textContent = res.ok ? `✓ 连接成功${latency}` : `✗ ${res.message}`;
+  },
+
   // 显示新建或编辑表单
   showForm(profile = null) {
     const panel = document.getElementById("profile-form-panel");
@@ -65,6 +127,9 @@ const Profiles = {
     document.getElementById("pf-api-key").value = profile ? profile.api_key : "";
     document.getElementById("pf-timeout").value = profile ? profile.timeout_seconds : 30;
     document.getElementById("profile-form-error").textContent = "";
+    const resultEl = document.getElementById("profile-form-test-result");
+    resultEl.hidden = true;
+    resultEl.className = "profile-test-result";
     panel.scrollIntoView({ behavior: "smooth", block: "start" });
   },