The large span truss gate structure is complex.Design calculation cannot be absolutely solved by graphic design method.Based on the working conditions and structural requirements of the gate,a structural form of panel and solid web thin frame and truss beam system combination structure is proposed.Both forward and reverse directions adopt simply supported wheels.To facilitate the installation and disassembly,the simply supported wheels are installed on the wing edges of the side columns.In response to the high risk of overturning of the locking beam and the difficulty of locking in place detection,the locking device adopts a rotating push-pull locking beam with an electric push rod operation.The article analyses gate structure layout,main beam,supporting structure,gate lock device,then arrangement of the large span truss gate structure is generally completed.The static analysis of the truss gate is conducted using the finite element method to identify the weak points of the structure and propose improvement measures.The strength and displacement of the improved gate structure can satisfy design specification in the operating mode of water retaining and gate lifting.The research results can provide references for the design of large-span truss gates.