Abstract: In this paper, the exterior structure and interior materials of the pantograph area of the high-speed EMU were studied. The changes of the sound insulation characteristics of the pantograph area before and after the new structure and the new materials were tested, contrasted and analyzed by the experimental method. The results showed that the noise level of the pantograph flat roof structure could be effectively improved in the whole frequency band by applying sound insulation hood, light sound absorbing cotton and ultra-thin sound absorbing plate in the pantograph flat roof foundation. The conclusion of this paper can provide experimental basis for the sound insulation design of the pantograph structure of EMU.