The disclosure discloses a method for mobility parameter negotiation between base stations (BSs). A target BS performs a mobility parameter decision and an optimization processing after receiving a mobility parameter modification request message from a source BS. When the processing succeeds, the target BS sends a mobility parameter modification acknowledgement message at least carrying a message type and a source cell ID to the source BS; when it fails, the target BS sends a mobility parameter modification failure message at least carrying a message type, a reason of failure, and the source cell ID to the source BS. A system for mobility parameter negotiation between BSs is also provided. Through the disclosure, the source BS is able to precisely recognize which source cell the mobility handover parameter negotiation is performed to, and further precisely knows which target cell the negotiation message comes from, thereby avoiding the inconsistency of the mobility parameter modification caused by message disorder, improving robustness of the mobility parameter modification and enhancing the network performance.