The linear FM Doppler fuze extract Doppler using secondary mixing method, which need more analog circuits and lead difficult to parameter adjustment. Direct IF sampling need higher sampling rate resulting in a large amount of data processing. Aiming at the problem, the linear FM fuze Doppler extraction method based on band-pass sampling is proposed in this paper. The method used band-pass sampling extract Doppler of linear FM Doppler fuze directly, not need secondary mixing and need subsequent analog circuits. The method not only extracts Doppler of linear FM Doppler fuze direct but also reduces the sampling rate. Simulation analysis and actual verification showed that the linear FM fuze Doppler extraction method based on band-pass sampling could extract Doppler, do not need secondary mixing and subsequent analog circuits, the amount of data after sampling is small and amount of data to be processed is small to.