The reconstruction project of Gecko River Bridge is a major livelihood project in Yangzhou City. The bridge spans the provincial backbone river - Bihu River. This river is a water channel into Huaihe River and plays an important role in flood discharge and waterlogging drainage. The main bridge is a 41 m + 150 m + 41 m three-span continuous steel box bowstring arch structure. The bridge is constructed by the less-support assembly method. The drainage impact of the river channel has been fully considered in the span layout and construction scheme of the bridge. The overall design, structural design, structural calculation and construction scheme of three-span continuous steel box bowstring arch bridge spanning the Bihu River are mainly introduced, which provides reference for similar projects.