Abstract: In the process of cannonball attacking target, the existence of conical rotation leads to the problem of distance travel of millimeter wave fuze echo, which can not be accurately ranging, and has an impact on the accuracy of cannonball attack. In order to solve the problem, the conical rotation model of warhead is constructed and deduced theoretically, and the main parameters affecting distance travel and echo delay caused by conical rotation are obtained. Then the conical rotation is approximated as uniformly decelerated motion to achieve coherent accumulation and acceleration compensation, and the Keystone transformation is used for distance dimension motion compensation. Finally, two-dimensional fast Fourier transform is used to achieve distance measurement. In order to verify the accuracy of the detection performance, Monte Carlo experiment is used for analysis. The simulation results show that the pitch angle, azimuth angle and conical rotation angle all have effects on the distance movement caused by conical rotation, and the Keystone transformation method can effectively compensate the existing distance movement phenomenon.