The invention discloses a method of realizing user scheduling in a wireless communication system. The method is characterized in that an access point CAP can work in a single user SU-MIMO mode or a multi-user MU-MIMO mode according to business types and queue dimensions; the CAP is used to configure downlink detection channels in system information channels of physical frames, and is used to allocate feedback resources for user stations STA in a control channel; the CAP is used to transmit the physical frames to the specified STA, and the physical frames are used to carry the MIMO control information, which comprises the identification IDs of the STA, the feedback request types, the feedback bandwidths, the feedback parameters, and the subcarrier grouping information; the CAP is used to receive the information fed back by various STA, and is used to select the proper MIMO modes for the downlink data transmission. The frequency spectrum resources can be scheduled in a self-adaptive manner, and the frequency spectrum utilization rate and the system performance can be improved.