Abstract: According to the relevant planning and technical data, it reasonably determines the Liangji canal flood control standard and the design of flood discharge, flood level, calculates the backwater height of the Liangji canal bridge, backwater curve and scour depth. It makes a comprehensive appraisal on the bridge flood control effect, including the adaptability analysis of the relevant planning, the existing flood control standard and the relevant technical requirements, the influence analysis of river regime stability,river dike, other water conservancy facilities and flood control and emergency rescue. It puts forward prevention and remedial measures to reduce and avoid the adverse influence of flood control caused by bridge construction.