Abstract: Changing the trajectory of a projectile can be accomplished by unbalancing the pressure distribution on the body surface and this usually is achieved by surface spreading techniques. The major drawbacks of such techniques are high drag force; fins aerodynamic heating, high time response and etc. To overcome these difficulties, recently application of plasma actuators has been evaluated numerically and experimentally. It is known that the time response of a projectile to control commands is a key factor to its CEP. In the present paper, unsteady flow around a supersonic projectile was calculated using Fluent software and its time response to a control command was analyzed. In this investigation, it is shown that using plasma actuator in comparison with aerodynamic fins can reduce the time response of a projectile about one order of magnitude. This reduction in time response can improve the performance of a projectile significantly.