As a cavity filling and sealing technology,sound insulation baffle have been widely used in the automotive industry.They are mainly used to block cavities,reduce noise,and prevent water vapor from entering the car,thereby improving the driving and riding comfort of the car.Various sealing-related problems will occur during actual use of the sound insulation baffle.Based on the conventional design of the existing sound insulation baffle,the influencing factors and solutions of the sealing performance of the sound insulation baffle by testing the acoustic performance of test sample of the sound insulation baffle were analyzed.