In order to improve the accuracy of Doppler signal frequency estimation of coherent wind lidar,Welch spectrum estimation combined with autocorrelation detection and energy barycenter method for frequency estimation is used in this paper.The signal is preprocessed by autocorrelation,then the power spectrum is obtained by Welch spectrum analysis,and the frequency is estimated roughly.Finally,the high-precision signal frequency is obtained by frequency correction by energy centro-baric method.Simulation results show that,this algorithm has lower mean absolute error and root mean square error and stable performance and is applied to the coherent wind lidar system,which is consistent with the simulation.