To solve the problem of main-lobe suppression jamming suppression in Pulse Doppler (PD) radar, two algorithms are proposed.The first algorithm, which is based on the idea of Blind Source Separation (BSS) in beam space, reduces the dimension of multi-beam echo after coherent integration to construct the signal to be separated, and takes Rényi entropy as the index to identify the separated source signals.The second algorithm, which is based on the idea of correlation filtering, takes one beam echo as the matching signal, performs correlation filtering on the other beam echo, and then obtains a suppressed beam echo through inverse operation.The simulation results verify the effectiveness of the proposed two algorithms.