diff --git a/web-app/src/app/pojo/ParamDefine.ts b/web-app/src/app/pojo/ParamDefine.ts
index 10fc0ba..8d2be81 100644
--- a/web-app/src/app/pojo/ParamDefine.ts
+++ b/web-app/src/app/pojo/ParamDefine.ts
@@ -2,7 +2,7 @@ export class ParamDefine {
   name!: string;
   field!: string;
   type!: string;
-  required: boolean | undefined;
+  required: boolean = false;
   defaultValue: string | undefined;
   placeholder!: string;
   range: string | undefined;
diff --git a/web-app/src/app/routes/monitor/monitor-edit/monitor-edit.component.ts b/web-app/src/app/routes/monitor/monitor-edit/monitor-edit.component.ts
index 5d8b1d8..3670414 100644
--- a/web-app/src/app/routes/monitor/monitor-edit/monitor-edit.component.ts
+++ b/web-app/src/app/routes/monitor/monitor-edit/monitor-edit.component.ts
@@ -77,6 +77,7 @@ export class MonitorEditComponent implements OnInit {
             let param = this.paramValueMap.get(define.field);
             if (param === undefined) {
               param = new Param();
+              param.field = define.field;
               param.type = define.type === 'number' ? 0 : 1;
               if (define.type === 'boolean') {
                 param.value = false;