How to set default value to ion-select?

 <ion-select class="border" interface="popover"  placeholder="Qualify Status"  [(ngModel)]="status_value" #status name="status" (ionChange)="getStatus(status_value)" >
          <ion-select-option *ngFor="let item of responseLeadStatus"  value="{{item.status_id}}" >{{item.status}}</ion-select-option>

I want to set default value to ion-select dynamically .i.e From .ts file to HTML
I also got status_id in .ts file.

What this actually means:

[ngModel]="status_value" (ngModelChange)="status_value = $event"

…so you already have a change handler, and I would suggest not having two of them.

Simply assign to the backing statusValue property.