Embodiments provide an access method and a device, where the method includes: determining that N second receiving devices communicate with a second sending device by using a radio resource, where N is a positive integer greater than or equal to 1; obtaining a receive effective channel vector from each second receiving device to a first sending device; obtaining a transmit antenna spatial correlation matrix of the first sending device; determining M transmit vectors; and separately communicating, by the first sending device, with K first receiving devices by using K of the M transmit vectors, where K is a positive integer less than or equal to M. According to the foregoing technical solutions, in a case in which the radio resource has been occupied by the second receiving device, the first sending device can send data by using the radio resource.