Abstract: A study using single-pulsed discharge plasma is performed on the flow control of asymmetrical vortices over slender conical forebody. The different circumferential static and dynamic pressure distributions are measured in the wind tunnel test. At the same time, the local side force, the increment of local side force and the overall side force and moment are calculated with the circumferential pressure distributions of different sections. The test result shows that we can use port singlepulsed discharge to achieve the linear proportional control of asymmetrical force and moment over slender conical forebody and have good linearity. Both ensemble averaged and phaselocked averaged dynamic pressure data at Section 8 have reached convergence. Compared with the phase-locked averaged pressure distributions of different phase angle at Section 8, the response of flow field is hysteresis of the pulsed modulating frequency.