A method for controlling access of a Closed Subscriber Group, CSG, in a dual-connection architecture, the dual-connection architecture referring to a User Equipment, UE, simultaneously maintaining connections with two different eNBs, wherein the UE is connected to a master eNB, MeNB, which is adapted to determine a CSG status of the UE via communication with an MME (602, 603), and based on the determination, a secondary eNB, SeNB, is added for simultaneous connection between MeNB, SeNB and UE, comprising: the MeNB acquiring CSG identity state information of the UE (602, 603); the MeNB determining a CSG access policy of the UE according to the acquired CSG identity state information of the LTE, wherein the CSG identity state information comprises: a CSG identity state, wherein the CSG identity state is a member or a non-member; and the MeNB transmitting the CSG identity state information to the SeNB; wherein the MeNB determining the CSG access policy of the UE according to the acquired CSG identity state information of the UE comprises: the MeNB determining whether the UE can access the SeNB according to the CSG identity state information; or the MeNB determining whether the LTE accesses the SeNB with an identity of a member or a non-member according to the CSG identity state information; or the SeNB determining whether the UE can access the SeNB according to the CSG identity state information; or the SeNB determining whether the UE accesses the SeNB with an identity of a member or a non-member according to the CSG identity state information; wherein the MeNB or SeNB determining whether the LTE can access the SeNB according to the CSG identity state information further comprises: if determining that the LTE can access the SeNB, the MeNB initiating an adding process of the SeNB; or if determining that the UE cannot access the SeNB, the MeNB not initiating the adding process of the SeNB; or if determining that the UE cannot access the SeNB, the SeNB refusing an SeNB adding request transmitted by the MeNB; characterized in that, a message for the SeNB refusing the adding request contains a cause value indicating that the SeNB refuses to be added or the CSG identity state information of the UE. the MeNB acquiring CSG identity state information of the UE (602, 603); the MeNB determining a CSG access policy of the UE according to the acquired CSG identity state information of the LTE, wherein the CSG identity state information comprises: a CSG identity state, wherein the CSG identity state is a member or a non-member; and the MeNB transmitting the CSG identity state information to the SeNB; wherein the MeNB determining the CSG access policy of the UE according to the acquired CSG identity state information of the UE comprises: the MeNB determining whether the UE can access the SeNB according to the CSG identity state information; or the MeNB determining whether the LTE accesses the SeNB with an identity of a member or a non-member according to the CSG identity state information; or the SeNB determining whether the UE can access the SeNB according to the CSG identity state information; or the SeNB determining whether the UE accesses the SeNB with an identity of a member or a non-member according to the CSG identity state information; wherein the MeNB or SeNB determining whether the LTE can access the SeNB according to the CSG identity state information further comprises: if determining that the LTE can access the SeNB, the MeNB initiating an adding process of the SeNB; or if determining that the UE cannot access the SeNB, the MeNB not initiating the adding process of the SeNB; or if determining that the UE cannot access the SeNB, the SeNB refusing an SeNB adding request transmitted by the MeNB; characterized in that, a message for the SeNB refusing the adding request contains a cause value indicating that the SeNB refuses to be added or the CSG identity state information of the UE. the MeNB determining whether the UE can access the SeNB according to the CSG identity state information; or the MeNB determining whether the LTE accesses the SeNB with an identity of a member or a non-member according to the CSG identity state information; or the SeNB determining whether the UE can access the SeNB according to the CSG identity state information; or the SeNB determining whether the UE accesses the SeNB with an identity of a member or a non-member according to the CSG identity state information; wherein the MeNB or SeNB determining whether the LTE can access the SeNB according to the CSG identity state information further comprises: if determining that the LTE can access the SeNB, the MeNB initiating an adding process of the SeNB; or if determining that the UE cannot access the SeNB, the MeNB not initiating the adding process of the SeNB; or if determining that the UE cannot access the SeNB, the SeNB refusing an SeNB adding request transmitted by the MeNB; characterized in that, a message for the SeNB refusing the adding request contains a cause value indicating that the SeNB refuses to be added or the CSG identity state information of the UE. if determining that the LTE can access the SeNB, the MeNB initiating an adding process of the SeNB; or if determining that the UE cannot access the SeNB, the MeNB not initiating the adding process of the SeNB; or if determining that the UE cannot access the SeNB, the SeNB refusing an SeNB adding request transmitted by the MeNB; characterized in that, a message for the SeNB refusing the adding request contains a cause value indicating that the SeNB refuses to be added or the CSG identity state information of the UE.