Abstract: The gas inside the cavity of the two-electrode plasma high energy synthetic j et actu-ator is electrothermally heated by the transient discharge of electric arc,that leads to a rapid in-crease in pressure within the cavity.This high-pressure gas ejects through the orifice and forms the high-speed jet.Considering the fast response character of the high energy synthetic jet,a sin-gle line torsion pendulum system for the impulse measurement is designed.Combined with the high-speed shadowgraphy,the development of the flow field and the impulse of the plasma jet are experimentally studied.The results show that the response time of the two-electrode plasma high energy synthetic jet is less than 10μs,and the duration time of the single-pulse jet is about 1ms. The maximum velocity of the jet front is about 190m/s,and there are shocks spreading at the speed of sound.The measurement accuracy of the single line torsion pendulum system isμN·s. The impulse of the two-electrode plasma high energy synthetic jet actuator is about 32μN·s. The total impulse increases linearly with the discharge frequency when the discharge frequency is low.