Abstract: This paper presents demonstration experiments on changing shock wave structure by dielectric barrier discharge (DBD). It shows that DBD can influence on the boundary layer. The intension of the shock wave decreases as the discharge obeys the flows, and it increases as the discharge disobeys the flows. When the discharge disobeys the flows, the ratio of pressure as discharge using three pairs electrode is greater than discharge using four pairs electrode. Because the discharge area is much smaller than the boundary layer in this experiment, the body force induced by plasma aerodynamic actuation is negligible compared with high speed flow aerodynamic force. Thus the effect on shock wave is pretty weak．