Abstract: The signal system is one of the main technical characteristics of the tram. Due to the particularity of right of way, the tram line switch control becomes one of the key technologies of the signal system. This paper introduced the existing line switch control technology, analyzed the overall structure and functions of the simulation system, used C# and C to design and develop the system with the help of Visual Studio 2013 and Keil integrated development environment. Based on the Urban Rail Control Lab of Southwest Jiaotong University, the simulation system was built, and the effectiveness was verified by simulation test. The system was different from the existing MATLAB simulation module. It was more real, and provided a reference example for the researchers.