An algorithm of robust linear processing for the downlink multiuser MIMO system with imperfect known CSI is proposed.This algorithm uses stable channel statistics information about the channel mean and antenna correlation

to minimize the average value of the all user’s total mean squared error over stochastic channel under the transmitter sum power constraint.This algorithm does not exactly depend on instantaneous channel information

when CSI obtained by channel estimation is not perfect

the performance loss due to the CSI mismatch can be efficiently reduced.Simulation results demonstrate that the proposed algorithm effectively ameliorate the BER and average MSE due to the CSI mismatch.