Method and system for configuring data carrying channel for user data by relay access system

The invention discloses a method and a system for configuring a data carrying channel for user data by a relay access system, which can increase data transmission rate. The method comprises the following steps of: in an initial access process or a switching process of user equipment (UE), transmitting information whether the UE is accessed from a Relay or not to a core network; and after the core network receives descending IP (Internet Protocol) data, only grouping the IP data of the UE accessed from the Relay, wherein each group of IP data corresponds to one or a plurality of data carrying channels arranged between the Relay and a donor evolved node B (DeNB). By the invention, the core network can know that the UE is accessed from a base station or a relay (Relay); and when the descending data is processed, a data carrying channel with a Un interface can be quickly configured for the IP data accessed by the relay (Relay) of the UE to increase processing efficiency.