Abstract: Present simulation method for micro-Doppler characteristics or approximate method of scattering computation is generally based on point-target model and its research result by these methods is hardly suitable for extended targets. For this reason, a simulation approach based on a powerful full-wave numerical method, hybrid FE-BI-MLFMA, is presented in this paper. By taking blunt-nosed cone target as an example, micro-Doppler characteristics of a conducting cone target and a head-coated cone target, under different types of micro-motions and polarizations, are investigated in this paper. The conclusion is that, though the intensity of micro-Doppler track is changed with polarization direction and coating structure, the form of micro-Doppler track is invariant. This research can provide quantitative reference support for recognition and identification of ballistic missile warhead and decoy.