How To Redirect Login Page ?

how to check on each page user is logged or not if user is not logged in it must be redirect to login page.

In order to access any page user must perform authentication .

You need to use an access control filter in your base controller.

Try these modules

http://www.yiiframework.com/wiki/423/installing-yii-users-and-rights-to-newly-created-yii-app/