Spatial stream determining method, base station and user equipment

The present invention provides a spatial stream determining method, a base station and a user equipment. The method comprises: the base station sends a feedback mode instruction to the user equipment, the feedback mode instruction being used to instruct the user equipment to feed back channel state report (CSR) information according to grouping granularities, and each of the grouping granularities comprising at least one spatial stream (101); the base station receives the CSR information sent by the user equipment for each of the grouping granularities (102); and the base station determines, according to the CSR information about each of the grouping granularities, a spatial stream used for transmitting data to the user equipment (103). The user equipment uses at least one spatial stream as a grouping granularity to report the CSR information, making the CSR information more accurate; and therefore, the present invention enhances the reasonability that the base station selects a spatial stream for transmitting the data and increases the utilization rate of system resources.