In order to improve the efficiency of wind turbine power generation, the working point and the optimal interval of fan power curve are analyzed, which provide the basis for power curve optimization. According to the monitoring data of the wind turbine, fitting the tip speed ratio curve. And then using the least squares method and look-up table to estimate the optimal power curve, combined with the tip speed ratio method ,to adjust the internal parameters of the wind turbine and optimize the power curve.The method uses the actual small and medium sized wind turbine to test,and it overcomes the limitations of the tip speed ratio method in real life,such as needing to establish accurate wind turbine model or wind speed measurement.And a single wind turbine to establish a model, the theoretical output power of high precision, with high self-adaptability. Through the comparison and analysis of the power curves of multiple wind turbines, it is found that this method has certain effect on optimizing the power curve of the wind turbine and can provide reference for t small and medium sized wind turbines.