diff --git a/app/admin/view/system/timer_config/edit.html b/app/admin/view/system/timer_config/edit.html
index 43e4852..50110f3 100644
--- a/app/admin/view/system/timer_config/edit.html
+++ b/app/admin/view/system/timer_config/edit.html
@@ -27,6 +27,23 @@
             </div>
         </div>
 
+        <div class="layui-form-item">
+            <label class="layui-form-label">并发数</label>
+            <div class="layui-input-block" style="padding-top:8px;">
+                <div class="layui-inline" style="margin-right:15px;">
+                    <input type="radio" name="concurrency_type" lay-filter="concurrency_type" value="default" title="默认（继承代码）" {if condition="$row.concurrency eq null"}checked{/if}>
+                    <input type="radio" name="concurrency_type" lay-filter="concurrency_type" value="custom" title="自定义" {if condition="$row.concurrency neq null"}checked{/if}>
+                </div>
+                <div class="layui-inline">
+                    <input type="number" name="concurrency" value="{$row.concurrency}" min="1" step="1" placeholder="正整数" class="layui-input" style="display:inline-block;width:120px;" lay-affix="concurrency_type">
+                </div>
+                <div class="layui-form-mid layui-word-aux">
+                    <span class="layui-badge layui-bg-gray">默认=继承代码</span>
+                    空值=继承；正整数=覆盖；0或负数=拒绝（防静默吞任务）
+                </div>
+            </div>
+        </div>
+
         <div class="layui-form-item">
             <label class="layui-form-label">同步状态</label>
             <div class="layui-input-block" style="padding-top: 8px;">
diff --git a/app/admin/view/system/timer_config/edit.js b/app/admin/view/system/timer_config/edit.js
index 4a445e0..9d3bfb3 100644
--- a/app/admin/view/system/timer_config/edit.js
+++ b/app/admin/view/system/timer_config/edit.js
@@ -1,3 +1,36 @@
 $(function(){
-    ua.listen();
-})
\ No newline at end of file
+    var form = layui.form;
+
+    // ============ 并发数：默认/自定义切换联动 ============
+    // 默认 → number input 禁用 + 提交时清空（写 NULL 继承）
+    // 自定义 → number input 启用，必须正整数
+    function syncConcurrencyInput() {
+        var type = $('input[name="concurrency_type"]:checked').val();
+        var $input = $('input[name="concurrency"]');
+        if (type === 'default') {
+            $input.prop('disabled', true).val('');
+        } else {
+            $input.prop('disabled', false);
+        }
+        form.render();
+    }
+
+    form.on('radio(concurrency_type)', function () {
+        syncConcurrencyInput();
+    });
+
+    // 初始化（根据模板 checked 状态同步）
+    syncConcurrencyInput();
+
+    // ============ 提交前归一化 ============
+    // 默认 → concurrency=''（后端 normalizeConcurrency 写 NULL）
+    // 自定义 → 保留输入值（后端校验正整数，0/负数/非数字被拒）
+    ua.listen(function (dataField) {
+        if (dataField.concurrency_type === 'default') {
+            dataField.concurrency = '';
+        }
+        // 移除辅助字段，避免传给后端
+        delete dataField.concurrency_type;
+        return dataField;
+    });
+});