A method for handover between secondary base stations, wherein the method comprises: selecting, by a network device, at least two candidate secondary base stations according to a measurement report reported by user equipment UE, wherein the network device is a master eNodeB; sending, by the network device, a prior-preparation instruction to each of the candidate secondary base stations, wherein the prior-preparation instruction is used to instruct each of the candidate secondary base stations to make a path handover preparation, so that each of the candidate secondary base stations waits to be selected by the UE as a target secondary base station, and the path handover preparation comprises at least one of the following: preconfiguring an access resource for the UE or establishing a data transmission channel with the network device; determining, by the network device, priority information of each of the candidate secondary base stations according to a measurement report and a load status of each candidate secondary base station that are reported by the UE and sending, by the network device, the priority information and configuration information of each of the candidate secondary base stations to the UE, so that the UE is handed over to the target secondary base station in the candidate secondary base stations according to the priority information and configuration information of each of the candidate secondary base stations when the UE needs to be handed over between secondary base stations; determining (506, 512), completion of an access process between the UE and the target secondary base station; and sending (507, 513), data to the target secondary base station, so that data transmission is performed between the UE and the secondary base station. selecting, by a network device, at least two candidate secondary base stations according to a measurement report reported by user equipment UE, wherein the network device is a master eNodeB; sending, by the network device, a prior-preparation instruction to each of the candidate secondary base stations, wherein the prior-preparation instruction is used to instruct each of the candidate secondary base stations to make a path handover preparation, so that each of the candidate secondary base stations waits to be selected by the UE as a target secondary base station, and the path handover preparation comprises at least one of the following: preconfiguring an access resource for the UE or establishing a data transmission channel with the network device; determining, by the network device, priority information of each of the candidate secondary base stations according to a measurement report and a load status of each candidate secondary base station that are reported by the UE and sending, by the network device, the priority information and configuration information of each of the candidate secondary base stations to the UE, so that the UE is handed over to the target secondary base station in the candidate secondary base stations according to the priority information and configuration information of each of the candidate secondary base stations when the UE needs to be handed over between secondary base stations; determining (506, 512), completion of an access process between the UE and the target secondary base station; and sending (507, 513), data to the target secondary base station, so that data transmission is performed between the UE and the secondary base station.