Micro-Doppler feature is an important reference for target recognition of ballistic missile. In high frequency radar system, the position relationship between warhead and radar directly affects the generation of radar echoes and micro-Doppler feature extraction subsequently, so the influence of occlusion effect must be considered. Firstly, the 3D Max software is used to model the geometry of cone warhead, and the 3D mesh model of the warhead target is obtained. Secondly, for the warhead vertex and empennage scatterers, the average normal vector method is used for occlusion judgment on the basis of plane hidden and elimination algorithm from the Computer Graphics, then the more real simulated echoes of target is obtained, which makes a preliminary exploration on echoes modeling and micro-motion characteristics analysis of ballistic targets under the occlusion condition. 