Abstract:The control system of vibration type cycle pulse electrochemical machining (PECM) was designed based on STM32. The touch screen was used as humancomputer interface.Using the system, the machining angle rang of pulse electrolysis was controlled by the feedback signal of encoder from servo motor. When the number of the feedback signal belonged to a section, the pulse electrochemical machining was processed. When the number of the feedback signal did not belong to the section, the pulse electrochemical machining was not processed. Thereby small gaps processing and large gaps clearance were realized. Moreover, through the design of relevant hardware and software of the control system, the functions including synchronous rotation of the two motors, smooth acceleration and smooth deceleration, accurate back to zero were realized. Using the control system, the realtime and accuracy of pulse electrolysis and the quality of pulse electrochemical machining can be validly improved.