Abstract: Micro-motion feature is one of the effective features used for radar target recognition in the middle section of the ballistic curve. To solve the problem of estimating spinning and structural parameters based on the micro-Doppler of the spinning warhead with fins in bistatic radar, the micro-Doppler models of the scattering centers at the edge of fins and the conjunction of the fins and the body of warhead are derived when the warhead is spinning firstly. Then the bistatic scattering coefficients of the warhead model are calculated by using FEKO. The micro-Doppler models are verified from the time frequency analysis on the bistatic scattering coefficients, and the characteristics of the micro-Doppler are summarized. Thirdly, the feasibility of extracting spinning and structural parameters in bistatic radar is analysed. Finally, because Hough transform can not estimate the parameters because of the flashes, a new idea to extract the parameters using the flashes is proposed.