In order to study the capacity of Tonggu channel in Shenzhen Port and improve its service level,the simulation model of Tonggu channel in Shenzhen port was constructed based on the Flexsim simulation platform by analyzing the operation process of the port and navigation system.Based on the prediction results of the number of navigable ships with different levels of annual segments,tonnages and cargo classifications,the capacity and service level of Tonggu channel in Shenzhen Port before and after the implementation of the second phase project are analyzed through simulation experiments.The results show that the second phase project of Tonggu channel in Shenzhen Port can effectively enhance the capacity of the channel,reduce the waiting time of ships and improve the service level of the channel.The research results can provide important decision support basis for channel construction scheme.