Abstract: Synthetic jet actuators with beveled orifices have been installed on both sides of a two dimensional rectangular jet wind tunnel, and have been adjusted to an appropriate angle. On the premise that the Coanda effect is not formed in the main jet, the main jet shear layer is induced by the unsteady disturbance of the synthetic jet, which causes the deflection of the main jet. By integrating with PIV test, the time-averaged flow field has been tested for low speed main jet controlled by synthetic jet actuator at different forcing voltages and frequencies. The results show that the active control of main jet vectoring deflection can be achieved only with the change of the forcing voltage and frequency. With the increment of the forcing voltage, the proportioned vectoring control of the main jet can be obtained. Forcing frequency has a significant effect on the vectoring angle of the main jet, and the maximal jet vectoring angle can be obtained at the resonance frequency of the actuator. Through "on-off" control on both sides of the synthetic jet actuator, the switching control of the main jet vector deflection can be achieved, and the process is continuous and controllable.