This paper aims to address the problems of poor pertinence and complex operation facing reinforcement calculation for ship lock projects by the 3D building information modeling（BIM）software Revit. Specifically，it achieves automatic and rapid calculation of reinforcement projects by secondary development in the software Revit，comparatively analyzes the calculation by the secondarily developed plug-in and reinforcement calculation by Revit，and verifies the application of the proposed plug-in with a ship lock project. The results show that the reinforcement calculation plug-in obtained by secondary development in Revit solves the problems of reinforcement calculation for ship lock projects by Revit，such as poor pertinence and complex operation. It also ensures the accuracy of reinforcement calculation and has wide applicability in ship lock projects. To a certain extent，it solves the difficulty in reinforcement calculation in ship lock projects.