A method for offloading processing service, comprising: acquiring, by a network element of an access network, a first packet carrying payload data and information of a destination end, and transmitted from a user equipment, the information of the destination end comprising an Internet Protocol, IP, address and a port number of the destination end; identifying a service type of the first packet by using a Deep Packet Inspection, DPI, technique; determining a transmission channel interface that corresponds to the identified service type according to a first correspondence relationship between service types and transmission channel interfaces; setting up (607, 505), by the network element of the access network, a second correspondence relationship between the information of the destination end carried in the first packet and the determined transmission channel interface; transmitting, by the network element of the access network via the transmission channel interface determined, the first packet to the destination end, acquiring (608, 401), by the network element of the access network, a second packet, wherein the information of the destination end is carried in the second packet, the second packet being a packet transmitted when the user equipment accesses the destination end for the next time or when another user equipment accesses the destination end; parsing (608, 506), by the network element of the access network, the information of the destination end from the second packet; determining (609, 507), by the network element of the access network, a transmission channel interface that corresponds to the information of the destination end carried in the second packet according to the second correspondence relationship between the information of the destination end and the determined transmission channel interface; and transmitting (609, 507), by the network element of the access network via the determined transmission channel interface, the second packet to the destination end that corresponds to the information of the destination end. acquiring, by a network element of an access network, a first packet carrying payload data and information of a destination end, and transmitted from a user equipment, the information of the destination end comprising an Internet Protocol, IP, address and a port number of the destination end; identifying a service type of the first packet by using a Deep Packet Inspection, DPI, technique; determining a transmission channel interface that corresponds to the identified service type according to a first correspondence relationship between service types and transmission channel interfaces; setting up (607, 505), by the network element of the access network, a second correspondence relationship between the information of the destination end carried in the first packet and the determined transmission channel interface; transmitting, by the network element of the access network via the transmission channel interface determined, the first packet to the destination end, acquiring (608, 401), by the network element of the access network, a second packet, wherein the information of the destination end is carried in the second packet, the second packet being a packet transmitted when the user equipment accesses the destination end for the next time or when another user equipment accesses the destination end; parsing (608, 506), by the network element of the access network, the information of the destination end from the second packet; determining (609, 507), by the network element of the access network, a transmission channel interface that corresponds to the information of the destination end carried in the second packet according to the second correspondence relationship between the information of the destination end and the determined transmission channel interface; and transmitting (609, 507), by the network element of the access network via the determined transmission channel interface, the second packet to the destination end that corresponds to the information of the destination end.