Abstract: To a time-varying MIMO wireless digital channel，we use inverse filter algorithm in channel receive end to get the channel pulse response function；and set the function as the initial value，then ，we utilize the particle filter algorithm to finish the MIMO channel tracking.The proposed algorithm uses the signal time diversity information as well as the signal space diversity information.Computer simulations illustrate that the proposed algorithm can achieve less channel error compared with using Kalman algorithm，and，it can get better convergence performance than using inverse filter algorithm under low SNR.