diff --git a/src/packages/discovery/component/setting/setting.component.html b/src/packages/discovery/component/setting/setting.component.html
index 61ee755..07aa306 100644
--- a/src/packages/discovery/component/setting/setting.component.html
+++ b/src/packages/discovery/component/setting/setting.component.html
@@ -13,7 +13,7 @@
         <!-- <form  (ngSubmit)="discovery()"> -->
           <div>
             <div>
-              <mat-checkbox [checked]="true" [(ngModel)]="hostChecked">Host</mat-checkbox>
+              <mat-checkbox [checked]="true" [(ngModel)]="hostChecked" (change)="handleHostCheckChange($event)">Host</mat-checkbox>
             </div>
             <div>
               <mat-form-field *ngIf="hostChecked">
@@ -26,7 +26,7 @@
           </div>
           <div>
             <div>
-              <mat-checkbox [(ngModel)]="portChecked">Port</mat-checkbox>
+              <mat-checkbox [(ngModel)]="portChecked" (change)="handlePortCheckChange($event)">Port</mat-checkbox>
             </div>
             <div>
               <mat-form-field *ngIf="portChecked">
@@ -39,7 +39,7 @@
           </div>
           <div>
             <div>
-              <mat-checkbox [(ngModel)]="serviceChecked">Service</mat-checkbox>
+              <mat-checkbox [(ngModel)]="serviceChecked" (change)="handleServiceCheckChange($event)">Service</mat-checkbox>
             </div>
             <div>
               <of-input-chip *ngIf="serviceChecked" [unselectedItems]="serviceItems"></of-input-chip>
diff --git a/src/packages/discovery/component/setting/setting.component.ts b/src/packages/discovery/component/setting/setting.component.ts
index fe002fc..a4cd06f 100644
--- a/src/packages/discovery/component/setting/setting.component.ts
+++ b/src/packages/discovery/component/setting/setting.component.ts
@@ -41,8 +41,8 @@ export class SettingComponent implements OnInit, AfterContentInit {
 
   ngOnInit() {
     this.settingSucceed$.subscribe(
-      (ds: DiscoveryStartInfo) => {
-        if (ds !== null) {
+      (succeed: boolean) => {
+        if (succeed) {
           this.started = true;
         }
       },
@@ -62,8 +62,6 @@ export class SettingComponent implements OnInit, AfterContentInit {
     const cidr = new CIDR(this.cidr);
     if (!cidr.isValid()) {
       alert('Invalid cidr : ' + this.cidr);
-      this.startIP = 'Unknown';
-      this.endIP = 'Unknown';
       return;
     }
     this.startIP = cidr.addressStart.address;
@@ -75,7 +73,26 @@ export class SettingComponent implements OnInit, AfterContentInit {
     this.endPort = '1024';
   }
 
+  handleHostCheckChange(e: MatCheckboxChange) {
+    this.hostChecked = true;
+    e.source.checked = true;
+  }
+
+  handlePortCheckChange(e: MatCheckboxChange) {
+    this.serviceChecked = false;
+  }
+
+  handleServiceCheckChange(e: MatCheckboxChange) {
+  }
+
   discovery() {
+    if (!this.portChecked) {
+      this.startPort = '0';
+      this.endPort = '0';
+    }
+    if (!this.serviceChecked) {
+
+    }
     const startInfo: DiscoveryStartInfo = {
       startIp: this.startIP,
       endIP: this.endIP,