A method for obtaining an X2 interface transmission address of a base station in an LTE system comprising a source base station and a target base station, wherein the source base station, using a constructed independent message, obtains through an S1 interface a target base station transmission address required for establishing an X2 interface connection, thus establishing the X2 interface connection between the source base station and the target base station, wherein the method comprises: through an S1 interface, the source base station sends (Step 401) a first constructed independent message being a transmission address request message to a Mobility Management Entity, MME, which transparently transmits (Step 402) the transmission address request message to a target base station, wherein the transmission address request message comprises target base station information; and through an S1 interface, the target base station sends (Step 403) a second constructed independent message being a transmission address request response message to the MME which transparently transmits (Step 404) the response message to the source base station, so that the source base station can initiate a process of establishing (Step 405) the X2 interface connection, wherein the transmission address request response message comprises one or more transmission addresses of the target base station which support the establishment of the X2 interface connection when the target base station responds successfully; characterised in that in step, the response is deemed to be failed when the transmission address request message is parsed in error or the transmission address is obtained in error by the target base station, and the transmission address request response message contains the reason of failure; wherein in step, when the response is failed, the transmission address request response message contains a latency time, and the source base station receiving the transmission address request response message executes step again when the latency time is exceeded; wherein the target base station information refers to a global identifier of the target base station; and wherein the one or more transmission addresses are configured in the background or obtained from a network-side database. through an S1 interface, the source base station sends (Step 401) a first constructed independent message being a transmission address request message to a Mobility Management Entity, MME, which transparently transmits (Step 402) the transmission address request message to a target base station, wherein the transmission address request message comprises target base station information; and through an S1 interface, the target base station sends (Step 403) a second constructed independent message being a transmission address request response message to the MME which transparently transmits (Step 404) the response message to the source base station, so that the source base station can initiate a process of establishing (Step 405) the X2 interface connection, wherein the transmission address request response message comprises one or more transmission addresses of the target base station which support the establishment of the X2 interface connection when the target base station responds successfully;