Disclosed is a multi-carrier configuration method in FDD. Also disclosed are a multi-carrier configuration apparatus in an FDD system, a user equipment access method and an apparatus, wherein the multi-carrier configuration method comprises: matching each carrier among Nu uplink carriers with any carrier among Nd downlink carriers respectively, wherein Nu and Nd are positive integers; and configuring at least one downlink carrier that is involved in matching among the Nd downlink carriers as a first-class carrier, wherein the first-class carrier bears configuration information of at least one uplink carrier among the Nu uplink carriers. The present invention can be used for flexibly matching the uplink and downlink carriers in the FDD system, thus enabling the uplink and downlink carriers to be matched according to requirements of a communication system in aspects of a system capacity, a system overhead, access resource allocation and the like so as to meet the corresponding requirements on the system capacity, the system overhead or the access resource allocation. In addition, the uplink and downlink carriers in the present invention can both support aggregation of small-bandwidth and narrowband carriers so that GSM refarming frequency spectrum resources can be utilized efficiently.