Abstract: An improved short-term overload control strategy of DFIG is proposed. Firstly,the basic theory and operation characteristics of DFIG are expounded. Then the working principle and limitations of the short-time overload control mode of DFIG wind turbines are analyzed. The hidden trouble of excessive release of rotor kinetic energy and the phenomenon of secondary frequency drop are analyzed.An improved short-time overload control strategy is proposed,and 3-machine 9-node system model is built by using Matlab/Simulink for simulation. The results verify the effectiveness to improve transient frequency response.