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In the scene of emergency relief, UAV (Unmanned Aerial Vehicle) can be used as emergency communication equipment to build emergency communication network. In the emergency communication system constructed by multiple UAVs, the load of UAVs will affect the communication quality of ground users. For communication load balancing, the trajectory optimization technology of UAV in multi UAV Communication system is studied. The virtual force field based on user position and the virtual force field based on UAV load are proposed, and the calculation formula of virtual force field is given. Based on the virtual force field, the motion control method of UAV is proposed, and the detailed motion control flow of UAV is given. Simulation results verify the effectiveness of the algorithm in UAV trajectory optimization, balance the user load between UAVs, and improve the user's communication throughput.