A data transmission method, wherein the method comprises: performing (301,302), by a terminal when the terminal performs transmission of same data with both a first base station accessed by the terminal and a second base station accessed by the terminal, transmission of to-be-transmitted data of the terminal with the first base station by using a first logical channel between the terminal and the first base station; performing, by the terminal, transmission of the to-be-transmitted data with the second base station by using a second logical channel between the terminal and the second base station, wherein the first logical channel and the second logical channel are associated with a same radio bearer of the terminal; characterized in that, the method further comprises: rccciving, by the terminal, configuration information sent by the first base station, wherein the configuration information comprises information about a manner in which the terminal performs data transmission with the first base station and the second base station; and when the configuration information comprises information indicating that the terminal performs transmission of the same data with both the first base station and the second base station, performing, by the terminal, transmission of the same data with both the first base station and the second base station. performing (301,302), by a terminal when the terminal performs transmission of same data with both a first base station accessed by the terminal and a second base station accessed by the terminal, transmission of to-be-transmitted data of the terminal with the first base station by using a first logical channel between the terminal and the first base station; performing, by the terminal, transmission of the to-be-transmitted data with the second base station by using a second logical channel between the terminal and the second base station, wherein the first logical channel and the second logical channel are associated with a same radio bearer of the terminal; characterized in that, the method further comprises: rccciving, by the terminal, configuration information sent by the first base station, wherein the configuration information comprises information about a manner in which the terminal performs data transmission with the first base station and the second base station; and when the configuration information comprises information indicating that the terminal performs transmission of the same data with both the first base station and the second base station, performing, by the terminal, transmission of the same data with both the first base station and the second base station. rccciving, by the terminal, configuration information sent by the first base station, wherein the configuration information comprises information about a manner in which the terminal performs data transmission with the first base station and the second base station; and when the configuration information comprises information indicating that the terminal performs transmission of the same data with both the first base station and the second base station, performing, by the terminal, transmission of the same data with both the first base station and the second base station.