Angular Material md-select default selected value

 <mat-select [value]="0" >

We can easily do it using setting value to default value

Use [(ngModel)]:

<mat-select [(ngModel)]="selectedOption">
  <mat-option value="1">One</mat-option>
  <mat-option value="2">Two</mat-option>
</mat-select>

Component:

selectedOption = '1';

DEMO

Edit #1:

Since Material2.0.0#beta10 (specifically this PR) you can select a value using the value property of MatSelect:

<mat-select [value]="selectedOption">
  <mat-option value="1">One</mat-option>
  <mat-option value="2">Two</mat-option>
</mat-select>

Component:

selectedOption = '1';

Note that you can also use it with two-way data binding -> [(value)].

DEMO

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