Abstract: The present invention discloses a method; a NodeB and a system for transmitting pairing information of auxiliary carriers. The method comprises: during the process of controlling a terminal which uses a multi-carrier high-speed packet access technique, a NodeB to which the terminal belongs setting pairing information of an uplink auxiliary carrier and a downlink auxiliary carrier of a auxiliary service enhanced dedicated channel cell for the terminal, and transmitting the paring information to a radio network control entity through control signaling transmitted via an Interconnection of type (IUB) interface. The present invention can implement flexible configuration for the uplink and downlink auxiliary carriers through signaling based on the IUB/IUR interface.