Abstract: It does not need the main beam alignment in a certain direction for the traditional satellite communication anti-interference algorithm, this will lead to the decrease of SNR decrease after interference-mitigating. In this paper, we consider beam-forming with the method of MVDR on the bases that the locations of communication satellites are known. The results show that not only the mitigation of interference is realized, but also an improvement of the SNR of output. The simulation results also show that: with the usage of beam-forming anti-interference in four element uniform circular array, the SNR of output can achieve an improvement of 5.89 dB if there is no interference. With Strong interference, the SNR of the output can improve more than 5 dB. Considering the difficulties of inverse matrix, LMS algorithm is deduced with constraints. Due to practical use in the estimation of the satellite position exist certain errors, simulation analysis is carried out for this error. It is concluded that the error of the satellite position estimation will not reduce the output of the 5 degrees of the synthesized gain.