Aiming at the disadvantages of the traditional control method of vehicle, the plasma with little scale control technology is used to investigate the influence on vehicle flow-filed. Based on the researches of the former experiment’ model and fly parameters, established a three-dimensional vehicle model, and a numerical study of the flow fields and pressure distribution rules is accomplished with different position and energy deposition of plasma actuation. The simulative results indicate that the plasma actuation has an effect on the structure of the initial shock wave through the interaction between plasma and boundary layer. It also shows that there are high pressure region at the position of plasma actuation. As the energy deposition is increasing, the extent and peak value of high pressure region would be augmented. The perturbation evolution has a 3-D characteristic; the perturbation can spread abroad the surface and influence the side face and even the whole circumference pressure distribution