There are still many single-line controlled river sections in the upper reaches of the Yangtze River,and the queuing phenomenon of ships in the area is serious.In order to explore the passing capacity of the control section,we combine the scheduling rules of the control segment signal table to introduce the queuing theory into the ship queuing research process,and establish an M/M/1 queuing service model with a priority.Taking the Wangjiatan control section as an example,we estimate the passing capacity of this section.The results show that the model calculates that the current average waiting time of the upstream section of the river section during the control and dispatching period is 32.5 minutes,and the downlink is 10.2 minutes.Based on the data of the ship and traffic flow,the passing capacity of the current control section is 191 million to 445 million tons,which is about 67.5% of the design passing capacity of the standard channel.This method can provide references for the similar projects.