In R9 version of LTE system, multi-user dual stream beamforming is proposed. To suppress inter-user interference of multi-user multiple input multiple output (MU-MIMO) systems, a new algorithm is presented in this paper. On condition that current user eliminates the interference to other users, it designs its own transmit beamforming vector; If all users take such measures, the interference each user suffers from others will be reduced to a minimum, which improves performance of the system.Compared with the traditional signal-to-leakage-and-noise ratio (SLNR) algorithm, simulation shows, as the number of user increases, the algorithm used in this paper can reduce the bit error rate (BER) of the system obviously.