A stepper module consisted of a memory element and a gate element was constructed in order to improve the reliability and economy of the automatic drill machine. The stepper module was used to design a several times feed pneumatic loop of automatic drill machine. Then simulating analysis for the pneumatic loop was done by using FluidSIM software. The results show that drill bit can complete the task of several times feeding motion. The accuracy and reliability of the stepper module in pneumatic loop are verified.