Abstract: An experimental study of the vortex flow control over slender forebodies was performed on a 20°circular-cone-cylinder model using a pair of SingleDielectric Barrier Discharge (SDBD) plasma actuators. Two different pairs of Single Dielectric Barrier Discharge (SDBD) plasma actuators are installed near the tip on the surface of the model. Three modes of operation of the actuators are defined. The plasma off mode corresponds to the case when neither the two actuators is activated, Port on and starboard on modes refer to the condition when the port side and the starboard side actuator is activated respectively. The pressure measurement test consist of measurements of circumferential pressure distributions over eight stations along the cone and were carried out in a lowturbulence 3.0m×1.6m lowspeed wind tunnel with a closed test section. The PIV measurement test consist of measurements the cross flowfield velocity over one station on a scaled model, the test was carried out in a 0.6m×0.5m low-speed open test section wind tunnel. The test angle of attack is 45°. The experiments indicate that an effective control on vertex flow over the conical forebody can be achieved using plasma actuation. The higher wind speed can be achieved by adjusting the position and direction of the plasma actuations.