There are aerodynamic noise, wheel/rail noise and equipment (structure) noise in the bogie area of high-speed train.In order to separate the noise, the operationaltransferpathanalysis (OTPA) is used in the bogie area. In the low-speed operation condition, the noise in the bogie area of the train is mainly the wheel-rail noise, and the structure noise generated by power equipment such as motor, axle box, gear box, etc. The aerodynamic noise is negligible,so the transfer function of the wheel-rail and the structure acoustic paths can be obtained by analyzing the transmission path of test data. In the high-speed operation condition, the response point noises of the bogie area in the transmission path analysis include the contribution of the two types of noises and the aerodynamic noise. The contributions of the wheel-rail and the structure noises under high-speed operation can be obtained by using the transfer function of the two types of noises obtained at the low-speed condition.Compared with the calculated total values, the contribution of aerodynamic noise can be accurately separated.The separation results show that the turning point of velocity dominated by aerodynamic noise occurs at the speed level of 200 km/h. However, at the speed level of 350 km/h, the contribution of the aerodynamic noise reaches 60%, and that of wheel-rail noise is about 30%, which cannot be ignored.