A method for downlink signal transmission, comprising: detecting, by a terminal device, a plurality of downlink signals sent by a network device, wherein the plurality of downlink signals are sent using different beams, characterized in that the method further comprises: sending, by the terminal device, first indication information to the network device, wherein the first indication information is used to indicate at least one target downlink signal in the plurality of downlink signals, and the at least one target downlink signal comprises one or more downlink signals in the plurality of downlink signals, measurement quality of which is poorer than measurement quality of any downlink signal other than the at least one target downlink signal in the plurality of downlink signals; and sending, by the terminal device, measurement quality of the at least one target downlink signal to the network device, and wherein sending, by the terminal device, the first indication information to the network device comprises: sending, by the terminal device, a first uplink signal to the network device, the first uplink signal carrying the first indication information, the first uplink signal being an uplink signal corresponding to the target downlink signal, and each downlink signal in the plurality of downlink signals signal having a correspondence with an uplink signal. detecting, by a terminal device, a plurality of downlink signals sent by a network device, wherein the plurality of downlink signals are sent using different beams, characterized in that the method further comprises: sending, by the terminal device, first indication information to the network device, wherein the first indication information is used to indicate at least one target downlink signal in the plurality of downlink signals, and the at least one target downlink signal comprises one or more downlink signals in the plurality of downlink signals, measurement quality of which is poorer than measurement quality of any downlink signal other than the at least one target downlink signal in the plurality of downlink signals; and sending, by the terminal device, measurement quality of the at least one target downlink signal to the network device, and wherein sending, by the terminal device, the first indication information to the network device comprises: sending, by the terminal device, a first uplink signal to the network device, the first uplink signal carrying the first indication information, the first uplink signal being an uplink signal corresponding to the target downlink signal, and each downlink signal in the plurality of downlink signals signal having a correspondence with an uplink signal. sending, by the terminal device, first indication information to the network device, wherein the first indication information is used to indicate at least one target downlink signal in the plurality of downlink signals, and the at least one target downlink signal comprises one or more downlink signals in the plurality of downlink signals, measurement quality of which is poorer than measurement quality of any downlink signal other than the at least one target downlink signal in the plurality of downlink signals; and sending, by the terminal device, measurement quality of the at least one target downlink signal to the network device, and wherein sending, by the terminal device, the first indication information to the network device comprises: sending, by the terminal device, a first uplink signal to the network device, the first uplink signal carrying the first indication information, the first uplink signal being an uplink signal corresponding to the target downlink signal, and each downlink signal in the plurality of downlink signals signal having a correspondence with an uplink signal.