The invention discloses a terminal attaching method. The terminal attaching method comprises the steps of setting an RN-EPC in a DeNB to authenticate UE based on user information which is pre-configured in an MIB table and corresponds to UE; if the authentication is successful, determining whether the cell where the UE currently locates is a contracted cell based on contracting data information of the UE; indicating the DeNB to accept the attaching request when the cell where the UE currently locates is the contracted cell; and indicating the DeNB to refuse the attaching request when the cell where the UE currently locates is not the contracted cell. Therefore, under the precondition of saving hardware resources, the terminal can be attached efficiently under the bad weather, and the use experience of the user is guaranteed.