Abstract: Plasma flow control is a widely used active flow control method. In order to further expand the application scope and understand the actuation mechanism, three kinds of AC-DBD (Dielectric Barrier Discharge) plasma actuator layout forms are used to compare the drag reduction capabilities of the L-shaped model after actuation, and the drag reduction mechanism is studied. The experiment is carried out in a low-speed DC wind tunnel, with a wind direction angle of 0°, and a wind speed of 2-8 m/s. These different actuators layout forms are the plasma actuator placed close to the leading edge along the incoming flow direction, the plasma actuator placed close to the leading edge against the incoming flow direction, and the plasma actuator arranged at the corner, respectively. Research shows that plasma actuators under different wind speed conditions have a certain control effect on drag reduction of bluff bodies, and the control ability decreases with the increase of wind speed. The plasma actuator placed in the corner produces the best control effect, and the drag reduction rate can reach more than 13% at low speed. The plasma actuator placed close to the leading edge against the incoming flow direction produces a similar effect. The drag reduction rate of the plasma actuator near the leading edge along the inflow direction can only reach about 7% at most. By analyzing the flow field, it is shown that the change of layout position produces different disturbance effects. Different flow control mechan-isms are the key factors affecting the actuation effect.