An access method performed by a terminal of a communications system, comprising: obtaining, by a terminal, at least two reference signal resources, wherein the at least two reference signal resources are respectively corresponding to a first transmission point and at least one second transmission point and the first transmission point is a transmission point currently accessed by the terminal; receiving, by the terminal, reference signals by using the at least two reference signal resources; obtaining, by the terminal, quality information of the reference signals according to a first precoding matrix and the reference signals; and sending, by the terminal, the quality information of the reference signals to the first transmission point; receiving, by the terminal, an instruction from the first transmission point to access a second transmission point; accessing the second transmission point in response to the instruction, wherein after the terminal accesses the second transmission point, the method further comprises: receiving, by the terminal, second indication information sent by the second transmission point, wherein the second indication information is used to indicate a second precoding matrix or a subset of the second precoding matrix that matches a first channel and is used by the first transmission point; and sending, by the terminal, fourth indication information to the second transmission point according to the second indication information, wherein the fourth indication information is used to indicate a third precoding matrix, or one or more other precoding matrices or a subset of the one or more other precoding matrices among a subset of the third precoding matrix except the second precoding matrix or the subset of the second precoding matrix indicated by the second indication information, wherein the third precoding matrix or the subset of the third precoding matrix matches a second channel, the first channel is a channel between the terminal and the first transmission point, and the second channel is a channel between the terminal and the second transmission point. obtaining, by a terminal, at least two reference signal resources, wherein the at least two reference signal resources are respectively corresponding to a first transmission point and at least one second transmission point and the first transmission point is a transmission point currently accessed by the terminal; receiving, by the terminal, reference signals by using the at least two reference signal resources; obtaining, by the terminal, quality information of the reference signals according to a first precoding matrix and the reference signals; and sending, by the terminal, the quality information of the reference signals to the first transmission point; receiving, by the terminal, an instruction from the first transmission point to access a second transmission point; accessing the second transmission point in response to the instruction, wherein after the terminal accesses the second transmission point, the method further comprises: receiving, by the terminal, second indication information sent by the second transmission point, wherein the second indication information is used to indicate a second precoding matrix or a subset of the second precoding matrix that matches a first channel and is used by the first transmission point; and sending, by the terminal, fourth indication information to the second transmission point according to the second indication information, wherein the fourth indication information is used to indicate a third precoding matrix, or one or more other precoding matrices or a subset of the one or more other precoding matrices among a subset of the third precoding matrix except the second precoding matrix or the subset of the second precoding matrix indicated by the second indication information, wherein the third precoding matrix or the subset of the third precoding matrix matches a second channel, the first channel is a channel between the terminal and the first transmission point, and the second channel is a channel between the terminal and the second transmission point. receiving, by the terminal, second indication information sent by the second transmission point, wherein the second indication information is used to indicate a second precoding matrix or a subset of the second precoding matrix that matches a first channel and is used by the first transmission point; and sending, by the terminal, fourth indication information to the second transmission point according to the second indication information, wherein the fourth indication information is used to indicate a third precoding matrix, or one or more other precoding matrices or a subset of the one or more other precoding matrices among a subset of the third precoding matrix except the second precoding matrix or the subset of the second precoding matrix indicated by the second indication information, wherein the third precoding matrix or the subset of the third precoding matrix matches a second channel, the first channel is a channel between the terminal and the first transmission point, and the second channel is a channel between the terminal and the second transmission point.