A method and a source evolved Node B (eNB) for performing cellular network relocation are provided. The method includes: sending, by a source eNB to a target eNB for relocation, a relocation Request (REQ) message configured to instruct the target eNB to execute a primary user-plane function, the relocation REQ message containing context information of User Equipment (UE) on the source eNB; and after receiving a relocation REQ Acknowledgement (ACK) message returned by the target eNB and configured to acknowledge that the target eNB is a primary eNB after relocation, sending, by the source eNB, context information of the primary user-plane function on the source eNB to the target eNB, and stopping executing the primary user-plane function, the relocation REQ ACK message containing a user-plane address for the target eNB to receive data packets after relocation.