We present the establishment of a simulation model utilizing multi-agent simulation modeling technology to encompass the ship entry and exit process,mooring,navigation,and wharf berthing operation in the Beihai district of Beibu Gulf Port.By quantitatively analyzing indicators of port throughput capacity and channel service level,we propose the long-term recommended scale and navigation standard of the main channel outside the gulf combining with the analysis of channel plane scale.Based on the analysis of the bottleneck of port throughput capacity and optimization of navigation standards for branch channels,we propose suggestions for optimizing the navigation standards of partial channel of Beimu Channel.The results show that the recommended navigation standards for the main channel should reach (100,000+50,000)t two-way navigation for ships by 2035,and further achieve (100,000+100,000)t two-way navigation by 2050.The navigation standard of the first section of Beimu Channel is optimized from one-way navigation of 150,000 t ships to two-way navigation to balance 20,000 t ships,which has a good effect on improving the port throughput capacity.