The present invention discloses a method and base station for implementing a carrier aggregation. The method comprises: a base station determines predetermined information, wherein the predetermined information comprises reserved resources for the carrier aggregation and the capability of a user terminal; the base station selects a first carrier resource from the reserved resources according to the capability of the user terminal and selects, for the user terminal, a second carrier resource for bearing data from the resources except the reserved resources; and the base station aggregates the first and second carrier resources. On the premise of reducing the inter-cell interference, the present invention can increase the number of the carriers used by the user terminal to meet the various requirements of a new wireless communication network and guarantee the communication quality of the wireless communication network.