Wind farm active power regulation should take into account the frequency control and damping inter-area power oscillation, thus it can have complete support ability and enhances the dynamic stability of power system. This paper, by analyzing the impact of wind power frequency control on inter-area power oscillation, puts forward the improvement scheme for wind turbine’s frequency control. Through the use of a first-order differential control loop, the frequency control of wind farm can always show a positive damping characteristic, so low frequency oscillation caused by wind farm active regulation is avoided. Finally, by means of theoretical analysis and simulation, this paper proves that wind turbine in the proposed control strategy not only has the frequency regulation ability, but also effectively improve the system damping characteristic after a disturbance occurs in the power system.