Abstract: The acquisition of radar echo signal is of great significance to the study of dynamic target recognition and radar imaging. In this paper, an echo simulation model based on time domain shooting and bouncing ray method (TDSBR) is proposed to simulate the radar echo of marine electrically large targets. The model uses TDSBR method to directly calculate the near-field composite scattering characteristics of target and sea surface under the irradiation of missile borne radar in time domain, and combined with the “stop-go” method to simulate the relative motion between radar and target, so as to realize the echo signal simulation of sea moving ship target under the irradiation of missile borne radar. The simulation results show that the model can effectively present the coupling effect between sea surface and sea target, and realize the prediction of target speed and distance with good accuracy and high efficiency. It has a good application prospect in echo prediction and target detection of missile borne radar in marine environment.