Based on the combination of blind source separation(BSS) and time-frequency spectrum analysis,a multi-component linear frequency modulation(LFM) signal detection method is proposed,and by adopting the concept of time-domain separation and time-frequency analysis,the method effectively suppresses the cross-term interference problem based on WVD detection method and prominently reduces the impacts of strong noise interference source on the traditional time-frequency analysis and detection method.The computer simulation results demonstrate that the proposed method for the multi-component LFM signal separation and feature extraction exceeds the traditional method of time-frequency analysis.