I Want to remove some suspended apps. how i can remove it?
If you mean from your user account, you can go to Settings->Applications on twitter.com and revoke access.
If you mean from your developer / apps account, use the red Delete Application button you can find on the page for each app at apps.twitter.com.
I am a Developer. If push the Red “Delete Application” button show me that error “The client application failed validation: Cannot delete suspended applications…”