The Luotian reservoir-Tiegang reservoir water conveyance tunnel project is one of the supporting projects of the Pearl River Delta Water Resources Allocation Project in Shenzhen. This project spans the urban built-up area and requires high building safety. This paper combines BIM and GIS technology, based on Dassault's 3D Experience platform, and integrates multiple information technology methods to carry out forward collaborative design and application, and establish a BIM application system for long-distance water conveyance tunnel engineering survey and design. During the implementation of BIM application, the forward design was driven by business processes, combined with the company's self-developed system, and digital survey applications were realized. Combined with BIM + GIS technology, through parametric modeling, simulation analysis and other means, this paper has achieved the linear engineering intelligent design, and improved the accuracy and work efficiency of the engineering design of the long-distance urban water conveyance tunnel. In the application of three-dimensional drawing output, this paper pioneered the symbolized drawing output method of safety monitoring, which filled the gaps in related fields in the industry. The successful application of the project's BIM technology guarantees the design progress and provides a data basis for the application of intelligent engineering during the construction period and operation and maintenance period. The results can provide references for similar projects.