Abstract: For the first time, the safe and reliable operation control of 350 km/h train in long distance by wireless communication were realized with the help of CTCS-3 train control system. Because of the complex structure and high integration of the system, the existing test methods can not meet the safety requirements. The usual testing method of signal system before was to select some key functions from the system functions and compile test tables for testing, which was random and may not be able to achieve integrity testing. Based on the analysis, a new test method of train control system function was put forward, that is, extracting the function characteristics of train control system, designing and planning test cases, and checking the running status and results of train control system in various scenarios and working modes one by one. It shows that it reduces the complexity of the test and improves the scientificity of the test method, the integrity of the test content and the rigor of the test data and conclusions.

Key words: high-speed railway, chinese train control system-3, Functional characteristics, test case, test sequence