Abstract: The effects on shock wave when cooling air was injected into the stator blade passage were studied in multi-schemes numerical research.The analysis was carried out for the changes of shock wave strength and direction,using the same inlet pressure and same temperature to inject cooling air at 5 different positions around the reflected shock generated point of the stator blade's suction side of high pressure turbine.The results show that it is a feasible method to control the intensity of shock wave by injecting cool-air at shock wave reflection point.Cooling injection has effect on local pressure field,leading to the change of the pressure gradient among the propagation region of shock wave.When the cooling inject position is at the reflection point,the intensity of shock wave can be reduced.