A method for transmitting data, comprising: receiving, by a terminal device, first indication information sent by a network device through a Media Access Control, MAC, Control Element, CE, wherein the first indication information is used for indicating whether a data duplication and transmission function is enabled for each Radio Bearer, RB, in at least one RB; and sending, by the terminal device, data to the network device according to the first indication information; characterized in that the first indication information carries an identification of the each RB, wherein the identification of the each RB is used for indicating that the data duplication and transmission function is enabled for a corresponding RB, or the identification of the each RB is used for indicating that the data duplication and transmission function of a corresponding RB is deactivated; sending, by the terminal device, the data to the network device according to the first indication information comprises: sending, by the terminal device, non-duplicated data to the network device through a logical channel corresponding to a Packet Data Convergence Protocol, PDCP, entity corresponding to a first RB of the at least one RB, wherein the data duplication and transmission function of the first RB is determined by the terminal device as deactivated according to the first indication information; wherein sending, by the terminal device, the non-duplicated data to the network device through the logical channel corresponding to the PDCP entity corresponding to the first RB, comprises: when the PDCP entity corresponds to a plurality of logical channels, receiving, by the terminal device, second indication information sent by the network device, wherein the second indication information is used for indicating a first logical channel not used for transmitting data in the plurality of logical channels; and sending, by the terminal device, the non-duplicated data to the network device through a second logical channel except the first logical channel in the plurality of logical channels. receiving, by a terminal device, first indication information sent by a network device through a Media Access Control, MAC, Control Element, CE, wherein the first indication information is used for indicating whether a data duplication and transmission function is enabled for each Radio Bearer, RB, in at least one RB; and sending, by the terminal device, data to the network device according to the first indication information; characterized in that the first indication information carries an identification of the each RB, wherein the identification of the each RB is used for indicating that the data duplication and transmission function is enabled for a corresponding RB, or the identification of the each RB is used for indicating that the data duplication and transmission function of a corresponding RB is deactivated; sending, by the terminal device, the data to the network device according to the first indication information comprises: sending, by the terminal device, non-duplicated data to the network device through a logical channel corresponding to a Packet Data Convergence Protocol, PDCP, entity corresponding to a first RB of the at least one RB, wherein the data duplication and transmission function of the first RB is determined by the terminal device as deactivated according to the first indication information; wherein sending, by the terminal device, the non-duplicated data to the network device through the logical channel corresponding to the PDCP entity corresponding to the first RB, comprises: when the PDCP entity corresponds to a plurality of logical channels, receiving, by the terminal device, second indication information sent by the network device, wherein the second indication information is used for indicating a first logical channel not used for transmitting data in the plurality of logical channels; and sending, by the terminal device, the non-duplicated data to the network device through a second logical channel except the first logical channel in the plurality of logical channels. sending, by the terminal device, non-duplicated data to the network device through a logical channel corresponding to a Packet Data Convergence Protocol, PDCP, entity corresponding to a first RB of the at least one RB, wherein the data duplication and transmission function of the first RB is determined by the terminal device as deactivated according to the first indication information; wherein sending, by the terminal device, the non-duplicated data to the network device through the logical channel corresponding to the PDCP entity corresponding to the first RB, comprises: when the PDCP entity corresponds to a plurality of logical channels, receiving, by the terminal device, second indication information sent by the network device, wherein the second indication information is used for indicating a first logical channel not used for transmitting data in the plurality of logical channels; and sending, by the terminal device, the non-duplicated data to the network device through a second logical channel except the first logical channel in the plurality of logical channels. when the PDCP entity corresponds to a plurality of logical channels, receiving, by the terminal device, second indication information sent by the network device, wherein the second indication information is used for indicating a first logical channel not used for transmitting data in the plurality of logical channels; and sending, by the terminal device, the non-duplicated data to the network device through a second logical channel except the first logical channel in the plurality of logical channels.