diff --git a/static/admin/agent.js b/static/admin/agent.js
index 082de5e..27bf38c 100644
--- a/static/admin/agent.js
+++ b/static/admin/agent.js
@@ -40,6 +40,7 @@ function openAgentConfig(){
     document.getElementById('acfg-base').value = r.api_base || 'https://api.deepseek.com';
     document.getElementById('acfg-model').value = r.model || '';
     document.getElementById('acfg-serial').value = r.default_serial || '';
+    document.getElementById('acfg-steps').value = r.max_steps || 40;
     document.getElementById('acfg-key-hint').textContent =
       r.api_key_masked ? ('已配置 ' + r.api_key_masked) : '未配置';
     document.getElementById('acfg-key').value = '';
@@ -54,6 +55,7 @@ function saveAgentConfig(){
     api_base: document.getElementById('acfg-base').value.trim(),
     model: document.getElementById('acfg-model').value.trim(),
     default_serial: document.getElementById('acfg-serial').value.trim(),
+    max_steps: document.getElementById('acfg-steps').value.trim(),
   };
   const key = document.getElementById('acfg-key').value.trim();
   if(key) body.api_key = key;
diff --git a/templates/admin/monitor.html b/templates/admin/monitor.html
index 6d81020..d5c4b5f 100644
--- a/templates/admin/monitor.html
+++ b/templates/admin/monitor.html
@@ -507,6 +507,9 @@ body{background:var(--bg);font-family:var(--body);color:var(--text);font-size:14
       <input type="password" id="acfg-key" class="form-control" placeholder="留空则不修改"></div>
     <div class="form-group"><label>默认设备 serial（可选）</label>
       <input type="text" id="acfg-serial" class="form-control" placeholder="192.168.20.66:5555" style="font-family:monospace"></div>
+    <div class="form-group"><label>最大执行步骤（1-200，默认 40）</label>
+      <input type="number" id="acfg-steps" class="form-control" min="1" max="200" placeholder="40"
+             title="单轮任务允许的最大工具调用轮数；超限会收尾总结（防死循环）"></div>
     <div style="display:flex;justify-content:flex-end;gap:8px;margin-top:6px">
       <button class="btn" onclick="closeAgentConfig()">取消</button>
       <button class="btn btn-primary" onclick="saveAgentConfig()">保存</button>
diff --git a/web/agent_api.py b/web/agent_api.py
index 1750915..e76adbd 100644
--- a/web/agent_api.py
+++ b/web/agent_api.py
@@ -35,7 +35,8 @@ bp = Blueprint("agent", __name__)
 _CFG_KEYS = {"api_base": "agent_api_base",
              "model": "agent_model",
              "api_key": "agent_api_key",
-             "default_serial": "agent_default_serial"}
+             "default_serial": "agent_default_serial",
+             "max_steps": "agent_max_steps"}
 
 # ---------- 运行状态（单实例 + 事件队列） ----------
 _run = {"id": None, "state": "idle", "prompt": "", "serial": "",
@@ -614,6 +615,10 @@ def _agent_thread(run_id, prompt, serial, cfg):
         agent.s.model = cfg.get("model") or agent.s.model
         agent.s.api_key = cfg.get("api_key") or agent.s.api_key
         agent.s.default_serial = cfg.get("default_serial") or agent.s.default_serial
+        try:
+            agent.s.max_steps = max(1, min(200, int(cfg.get("max_steps") or 40)))
+        except (TypeError, ValueError):
+            pass  # 非法值用默认 40
 
         with _lock:
             history = list(_run.get("history") or [])