Carbon fiber reinforced plastics is one of typical difficult to machine materials which will easily bring on disfigurements such as burrs, delamination and avulsion during drilling. In order to improve the drilling quality,the carbon fiber/ epoxy(C/E) composite was studied, and a grinding drill and its new process were developed. Some experiments on the grinding tool were carried out. The results show that the thrust force decreases by 30% -50%, the tool life is improved by 3 to 5 times and the disfigurements are minimized compared with the traditional carbide twist drill.