A complexity-reduced recursive algorithm of joint channel estimation and data detection based on decision feedback modified-hybrid-MLSE(DF-MHMLSE)with diversity combining is presented for MIMO time-varying multipath channel.Only a few of pilot symbols are needed for channel estimation initialization,on basis of that,the tentative decision symbol vectors set and tentative channel vectors set are obtained by using modified hybrid MLSE(MHMLSE)to each MISO subsystem respectively.The optimal decision symbol vector is acquired according to diversity combining ultimately,and the channel vectors are adaptively updated.The algorithm greatly reduces the complexity,detects by symbol with lower BER.