A method of sending a transmission configuration indication, TCI, state, applied to a network-side device, the method comprising: based on a link type, selecting at least one TCI state from a plurality of candidate TCI states configured in advance; and establishing a TCI state table according to the at least one TCI state, wherein, the TCI state table comprises correspondence relationship between the TCI state and an RS set, correspondence relationship among the TCI state, the RS set, and a Quasi-Co-Location, QCL, type, or correspondence relationship between the TCI state and a channel type; sending the TCI state table and an identifier of a link type corresponding to the TCI state table; wherein after sending the TCI state table and the identifier of the link type, the method further comprises: sending TCI state indication information, wherein the TCI state indication information carries a target TCI state in the TCI state table; in a case that the target TCI state is used to indicate the TCI state of a data channel, the TCI state indication information is sent through a Downlink Control Information, DCI, message or the TCI state indication information is sent through an RRC message, or is sent jointly through an RRC message and a MAC CE message; if the TCI state of the data channel is to be sent and the TCI state needs to be sent through the DCI message and a signaling field for sending the TCI state is disabled in the DCI message, then before sending the DCI message, the methods further comprises: indicating, through sending an RRC message or a MAC CE message, the signaling field for sending the TCI state to be enabled in the DCI message. based on a link type, selecting at least one TCI state from a plurality of candidate TCI states configured in advance; and establishing a TCI state table according to the at least one TCI state, wherein, the TCI state table comprises correspondence relationship between the TCI state and an RS set, correspondence relationship among the TCI state, the RS set, and a Quasi-Co-Location, QCL, type, or correspondence relationship between the TCI state and a channel type; sending the TCI state table and an identifier of a link type corresponding to the TCI state table; wherein after sending the TCI state table and the identifier of the link type, the method further comprises: sending TCI state indication information, wherein the TCI state indication information carries a target TCI state in the TCI state table; in a case that the target TCI state is used to indicate the TCI state of a data channel, the TCI state indication information is sent through a Downlink Control Information, DCI, message or the TCI state indication information is sent through an RRC message, or is sent jointly through an RRC message and a MAC CE message; if the TCI state of the data channel is to be sent and the TCI state needs to be sent through the DCI message and a signaling field for sending the TCI state is disabled in the DCI message, then before sending the DCI message, the methods further comprises: indicating, through sending an RRC message or a MAC CE message, the signaling field for sending the TCI state to be enabled in the DCI message.