This paper presented a new method to suppress vortex-induced vibration by controlling the phase of fluctuation aerodynamic loads with synthetic jet. In order to verify the phase control function of synthetic jet and study the parameters range in which the phase control can be implemented, the two-dimensional unsteady flow around E214 airfoil was simulated numerically with CFD software. The time history of lift coefficient was obtained. The fast Fourier transform (FFT) was performed to get the fundamental frequency of fluctuation aerodynamic loads under large attack angle without synthetic jet control. The method to judge whether the synthetic jet can control the phase of fluctuation aerodynamic loads was obtained. Based on the data of a series of numerical simulation, the velocity- frequency ranges in which the synthetic jet can control the phase of fluctuation aerodynamic loads were obtained. The results have shown that the velocity and frequency of the synthetic jet can influence the phase control function of the synthetic jet significantly. When the frequency of the synthetic jet is close to the frequency of fluctuation aerodynamic loads without synthetic jet control, the synthetic jet can achieve phase control with lower control energy. On the contrary, much control energy is needed.