In order to realize the interval detection in the punching process of the hydraulic press, and to judge the value of the interference of the workpiece through the working state of the system to ensure the press mounting quality of the workpiece, the pressure detection system with displacement sensor, displacement transmitter, analog input module and touch screen display as the main modules was designed and reformed. The results show that the system can be used to realize realtime monitore the running state, and the integration of supervision, management and control is realized.