Abstract: ?The method that have improvements to the previously reported EVAD technique to obtain horizontal divergence are discussed in detail. Sirmans' method of radar simulated precipitation signal is applicable to the nonlinear wind field including the three harmonic, and a Doppler velocity field is obtained that is approximated to the real velocity field. The improved EVAD method, Srivastava's and Matejke's EVAD methods are applicable to this simulated Doppler velocity field, and three methods are compared. Computing results indicate that the accuracy of horizontal divergence is obtained by the improved EVAD method is enhanced at not full azimuth wind field, at different v and SNR.