The wear drilling experiment of the CFRP/TC4 was carried out by using the self-grinding tool and compared with the ordinary twist drill. The wear process of stepped drill was analyzed. The experimental results show that the main wear area of the stepped drill is chisel edge, the first flank face and the second flank face, and the second flank wear is the most serious. The drilling force of the stepped drill is smaller than that of ordinary twist drill.The tool life of step drill is much higher than ordinary twist drill.