The passenger compartment lighting system of the high-speed train can select lighting modes for the lamps at the control equipment end, including fully open mode, semi open mode, fully closed mode, and adaptive mode, so as to provide sufficient lighting services for passengers in various scenarios. When completing the development of the lighting system and control logic, it is necessary to verify the system. The traditional testing method is to build a minimum system and use limited lighting fixtures for simple verification of the system. This testing method cannot verify the state logic of all lighting fixtures in all passenger compartments, resulting in insufficient verification; Additionally, by manually modifying code to enforce program related data, comprehensive verification can be achieved, but this approach is inefficient and wastes manpower and resources. In order to ensure the stability of the passenger compartment lighting system and improve testing efficiency, this article adopts a serial port tes