Accurate simulation of wind turbine radar echo signals and analysis of its Doppler characteristics are of great significance to solving the problem of passive interference from wind turbine to radar stations. Aiming at the problem that existing methods can only consider monostatic scattering, this paper derives the bistatic echo formula of the wind turbine blade in the presence of ground based on the multipath effect. The equivalent calculation model of the scattering paths between the wind turbine blade and the ground is deduced based on the principle of mirror image and the simulation method for the bistatic echo of wind turbine blade in a half-space is proposed. In the case of the Vestas-V82 wind turbine, the wind turbine blade bistatic echo in the presence of ground is simulated and compared with the monostatic echo. The results show that when the position of the transmitting radar and the receiving radar are different, it will cause the echo to increase a set of Doppler flicker and reduce the maximum Doppler frequency of the echo. It provides a reference for the identification of wind turbine radar echo signals.