In order to improve the femtosecond laser processing morphology and increase the processing depth,a high-frequency pulsating gas jet system was designed.The bistable fluidic switch was used to realize the coupling of high frequency vibration and the jet to form a pulsating jet.There are two mechanisms for the structure to form a pulsating jet:the first is the sound pressure generated by the mass flow entering the air,which can theoretically generate vibrations of about 2 500 Hz;the second is the vibration generated by the jet during the opening and closing process.The CFD technology was used to explore the influence of various structural parameters of the jet nozzle on the jet effect.The simulation results show that the control runner width,the sidewall inclination and the power runner width have the greatest influence on the switching time,the pressure amplitude and the outlet velocity,respectively.When the sidewall inclination is 12°,the control runner width is 0.7 mm and it is perpendicular to the output runner,the splitter distance is 8 mm,and the power nozzle width and the power runner width are 1 mm,the most ideal optimization results are obtained.