The Changshou Yangtze River Bridge from Yubei to Huaihua Railway crosses the Yangtze River at the Shantuo Waterway in the fluctuating backwater area of the Three Gorges Reservoir.The waterway is divided into left and right navigation holes by the main span bridge of Changshou Bridge. The bridge does not meet the requirements for the navigation clearance of single span two-way or double span one-way in Class I channel. From the perspective of navigation safety，this paper takes the width of Class I channel required by the Code for Design of Waterway Engineering as the minimum span of river crossing structures combining with representative ship types and channel characteristics，opens the right hole as an auxiliary navigation hole in combination with river channel conditions during high water level periods，defines the boundaries of the navigable water area in the bridge area by reasonably setting buoys，and takes measures such as adding a bridge anti-collision active early warning system to ensure navigation safety.