Radar echoes with unique doppler characteristics are generated during the rotorcraft flight. By accurately simulating target echoes, it provides an important basis for the accurate identification and classification of different types of aircrafts. Aiming at the hypothesized defect of the existing scattering-point integral algorithm, a rotor blade echo simulation method based on scattering electric field is proposed from the theory of high frequency electromagnetic scattering. According to the mathematical relationship between the radar echo and the scattering electric field, the consistency of the target echo signal and the baseband signal with the complex amplitude vector of the target backscattering electric field was found. Based on this, the physical optics-moment hybrid algorithm is used to solve the scattering electric field of the aircraft rotor, and the time-frequency characteristics of the echo are obtained by the short-time Fourier transform. Finally, by comparing the traditional scattering point integration algorithm, the influence of different blade angles on echo signals is analyzed and the correctness and superiority of the proposed method are verified. The accurate acquisition of doppler echo of aircraft rotor under the scattering electric field is realized. It provides certain application value for the identification and classification of target aircraft.