Multiple antennas are used to increase the capacity and spectrum efficiency of communication system, thus can improve the transmission rate and the communication quality. This paper applies the MVDR adaptive beamforming algorithm, to suppress interference signals in multi-antenna communication system . Meanwhile, one of the blind source separation algorithms, FastICA algorithm, is used to separate the interference signals and desired signals, which also achieves the effect of anti-interference. Through simulations, the paper compares the impact of array error and signal to noise ratio on these two algorithms, and analyzes the cause of their different anti-interference performances. Based on the analysis, the applicable conditions and application advice on these two algorithms are given.