Abstract: Aiming at VOBC equipment in CBTC test platform, this article designed the interactive process between simulated vehicle and several common train running scenarios to test its control function. Using computer simulation technology, the communication between simulation vehicle subsystem, vehicle interface adapter and VOBC physical equipment was implemented by programming with Microsoft Visual Studio development tool and C# language, and the construction of VOBC functional testing framework was completed. In the three operating scenarios of emergency braking, RMF driving mode selection and ATO automatic driving, the interaction process between simulated vehicle and VOBC equipment was designed. Through the actual project test, the design can complete the test of VOBC control function. This provides a feasible technical scheme for VOBC equipment function test, and also provides a reference for other equipment test in CBTC test platform.