With PVDF piezoelectric film as the data collection terminal and according to the actual need for structural optimization, a force transducer module for combat game was fabricated. By comparing the natures of the charge amplifier, the emitter follower, the voltage follower and characteristics of the actual work, the voltage follower based on AD74KR op amp was designed as the control circuit. The engineering prototype was fabricated finally through the equivalent analysis and simulation implementation according to their respective operating principle.