首先由线性波动方程推导出车内声场的边界积分方程，经边界元离散得到已知声场边界的振动速度场，求解其内部声压的线性方程组。进一步提出边界表面上的声压对声场内某点声压的贡献度概念，为降低车内某点处的声压提供对车室壁板进行结构修改的理论依据，最后对这一理论进行了验证。 First, the boundary integral equation of the sound field in the vehicle is deduced from the linear wave equation, and the vibration velocity field of the boundary of the known sound field is discretized by the boundary element to solve the linear equations of the internal sound pressure. The concept of the contribution of sound pressure on the sound pressure at a point in the sound field is further proposed. The theoretical basis for structural modification of the vehicle wall siding is provided to reduce the sound pressure at a certain point in the vehicle. Finally, verification.