In this paper,the state-of-the-art and adaptability to formation of PDC bit were presented,the form mechanism of PDC bit whirling motion was analyzed,and the methods of prevention bit whirling motion were introduced.According to the requirement of bit steady drilling,the optimization design of prevention bit whirling motion was done.Through field application,the results showed that the anti-whirl PDC bit could shorten drilling cycle,improve drilling speed,prolong operating life,and the borehole inclination was controlled well.