In order to get rid of the inefficient and repetitive work in the previous three-dimensional design and to improve the level and efficiency of the three-dimensional design of long-distance diversion and water diversion engineering, the parametric design concept was integrated into the building from the beginning of modeling. First, the BIM model of typical buildings for water diversion project was established, and then a set of C/S framework based 3D parametric design platform is developed with C# programming language based on component object technology (COM) and Inventor API (application program interface) technology. By building a database to store all kinds of models and information, and integrating cloud platform based collaborative design technology, the project drawings can be generated efficiently and quickly and the functions of collaborative office are realized. The system has been applied to a long distance diversion and water diversion project with remarkable effect and wide application prospect.