Multiuser multi-input multi-output system, base station, customer equipment and CQI feedback method

The invention provides a multi-user multi-input multi-output (MIMO) system, a base station (BS), user equipment (UE) and a CQI (channel quality indicator) feedback method, wherein, the multi-user MIMO system comprises the BS and the UE, and the BS and the UE are communicated through a wireless network; the UE is used for feeding back a CQI corresponding to a first Rank which is dispatched last time; and the BS is used for acquiring CQIs corresponding to all the Rank of the UE according to the CQI corresponding to the first Rank fed back by the UE, and carries out dispatching according to the CQIs corresponding to all the Rank of the UE. The invention has the advantages that the performance of system throughput is effectively improved; and the cost of uplink signaling is not increased.