Abstract: In view of great noise during the train operation of Guangzhou Metro Line 7，through a systematic train noise test，the influence characteristics of vehicle design，wheel/rail state and other factors on train noise are analyzed，train running noise control measures are studied from the aspects of train tightness，rail grinding，train running speed and so on. The research shows that the main train noise comes from the wheel and rail，which can be improved by way of rail grinding，train speed limit，side door sealing rectification and so on. This paper provides design suggestions and reference for the study of subway train noise.