Abstract: In order to improve the mixing efficiency of rocket engine propellant and to explore the influence of plasma on the mixing characteristics of single rectangular jet, a plasma jet generation and control system is designed. Particle image velocimetry is used to measure the influence of surface dielectric barrier discharge plasma actuator on single jet mixing. Compared with non-excitation condition, when the excitation voltage is 5, 6 and 7kV, the width and mixing characteristics of jet are enhanced with the increase of voltage, and the maximum attenuation rate of jet centerline speed increases by about 20%; the jet decays and its width increases obviously while the pulse frequency increases; when the excitation voltage and the pulse frequency are fixed and the duty cycle is changed, the width of jet is the largest in the range of 50%~70%, where the decay effect is the strongest.