Here are three things you can do if your partner is aggressive or violent:
1. Seek help and support if you feel in any danger - see above
2. Understand that your partner's behaviour (whilst unacceptable) is a consequence of a severely damaged self-esteem. They have lost much of their natural connection to love. You can help them by beginning to reawaken this in them.
3. By far the best way to do this is to find your own self love so you can remind your partner of their's. You will need to find out why you and your partner turned away from a state of self-love and then heal the negative self-beliefs that damage your self-esteem. My website and books describe this process in detail.