This article mainly concern the sound material in the engine compartment of a passenger car, and obtain that the old material which can not satisfy the need have to be replaced.

• 摘要通过测量分析发动机舱内噪声频谱特性，对某型客车发动机舱的原用吸声材料进行测量，并得出了原有材料选用不适当的结论。