Abstract: SMeared SPectrum (SMSP) jamming is composed of multiple LFM sub-signals in time domain. In order to reconstruct the SMSP jamming with signal processing tools, multiple-filtering is inevitable. For this problem, this paper analyzes the time-frequency characteristic of SMSP jamming. On this basis, a jamming suppression algorithm jointing Time-Frequency Reassignment (TFR) and Biorthogonal Fourier Transform (BFT) is proposed. Firstly, the number of jamming sub-signals is estimated according to the Radon transform result of echo TFR matrix. Secondly, based on sub-signals number, the reference signal is designed to modulate jamming signal into a LFM signal. Then, the jamming signal is reconstructed by BFT peak filtering and demodulation. Finally, by subtracting reconstructed signal from echo, the purpose of jamming suppression is realized. The simulation results show that the proposed algorithm do not need to estimate all the jamming parameters and the jamming signal can be reconstructed accurately by once filtering and demodulation process. After cancellation, the SMSP jamming in echo is effectively suppressed.