The invention discloses a method for establishing the service bearing of user equipment and a device thereof, wherein the method comprises the following steps: the user equipment sends a service request; after the user equipment is overloaded by a service gateway selected by a mobile management entity during the attachment, the user equipment uses the mobile management entity selected by an access network to redetermine the service gateway used for overloading the user equipment during the attachment; and the redetermined service gateway is used for establishing the service bearing and air interface connection for the user equipment. The adoption of the invention solves the problems existing during the process of establishing the service bearing of the user equipment in the overloading ofthe service gateway.