As the high signaling cost and low data transmission efficiency of traditional mobile management strategy in 5G ultra-dense network deployment, this study proposed a handover algorithms in 5G based on SDN architecture. By the use of the global network state information in SDN controller to make the optimal handover decision, the delay and network resource cost caused by mobile node collecting network status information can be reduced. The proposed handover management strategy is simulated by Matlab. Compared with the handover management mechanism of LTE system, it has advantages in handover delay and average handover times.