Based on the space time adaptive processing technology and in combination with the practical application of digital multi-beam faggot antenna, an improved space time adaptive processing algorithm is put forward. The method is used to solve the problem—that is—traditional space time filtering algorithm can suppress jamming signals, but, at the same time, it can lead to attenuate the signals available of the satellite when the angle between jamming signal and satellite signal is close enough, so that this affects the anti-jamming capability of receiver. The simulation and actual results show the improved space time adaptive processing algorithm is better than the traditional method while the angle between satellite signal and jamming signal is close to 10 degrees and there exists jamming signals.