Dynamic flow metering performance is one of the important indicators of the flow meter,and the source of dynamic gas flow is an essential unit to study the dynamic performance of the flow meter.Based on the feasibility and accuracy of evaluating the dynamic performance of a gas flow meter,a piston dynamic gas flow generator was designed. Based on the theoretical analysis, the AMESim simulation model of the device was established, and the corresponding dynamic flow curve and piston velocity’s relationship were obtained. A DSPbased control program was developed and an experimental study was carried out in conjunction with a critical flow nozzle. The results show that when the critical flow nozzle’s nominal flow rate is 1 m3/h, the sine wave output is above 0.323 g/s, the frequency is 0.1 Hz.