To study navigation efficiency of the double-track bridge’s bridge area, bridge area of the doubletrack bridge is considered as a tandem queuing network to analyze their navigating efficiency. The two series of queuing system model are built to simulate bridge area of double-track bridge. Single bridge is considered as M/M/1 queuing system to calculate its navigation efficiency. The navigation efficiency on peak time and daily time has been analyzed. After analyzing the simulating and calculating results, two types of bottlenecks in the system are indentified, and the reasons of bottlenecks are found. Then, the suggestions will be given about the bridge site selection and ship traffic organization during operation.