In order to realize the decoupling control of dq axis for three-phase PV grid-connected system and speed up the system dynamic response speed, a decoulpling control strategy is proposed in the synchronous rotating reference frame. Meanwhile, PV array power feed-forward and full grid-voltage feed-forward control are respectively introduced into the voltage outer loop and current inner loop. The coupling terms are considered as disturbances, and the feed-forward decoupling coefficients are obtained by solving the closed loop transfer function, and the decoupling effect of the dq axis is analyzed when the filter parameters change. The system simulation model is established by Matlab, the simulation results show the proposed control strategy makes the three-phase PV grid-connected inverter with LCL filter not only realize the decoupling control of dq axis, but also has good static and dynamic performance under the condition of the strong robustness and high grid current quality. This work is supported by Science and Technology Support Project of Gansu Province (No. 1204GKCA038).