In order to obtain the law of the influence of motion factors of cone carrier on the Doppler frequency of radar fuze echo in its reentry flight, the motion model of the carrier is constructed accurately through the establishment of multi-coordinate system and by use of the conversion between the coordinate systems.Analysis is made to the influence of such motion factors as flight velocity, reentry dip angle, swing and cone on the Doppler frequency components of the radar fuze echoes in the time-frequency domain.In order to verify the correctness of the law of influence, the echo signal of the radar fuze is simulated by using Matlab software with the Short-Time Fourier Transform (STFT) as the central idea.The simulation results are consistent with the theoretical values.It shows that the motion model is reasonable and the law of influence is correct.