本文对哈船院柴油机水下排气噪声实验用四壁倾斜水池的低频声场特性进行了理论计算和实验测量。在理论上采用边界无法对水池点源声场进行数值模似，并将计算结果与球面波扩展规律进行比较。利用柴油机水下排气管口体积脉动声辐射作为声源在柴油机排气频率范围内和常用测点区域内对水池进行声场特性测量。这一工作对柴油机水下排气噪声的实验研究和理论预报有一定的指导作用。 In this paper, the theoretical calculations and experimental measurements of the low-frequency sound field characteristics of a four-wall inclined basin for the experiment of underwater exhaust noise of a diesel engine at Haloon Institute were carried out. In theory, it is impossible to simulate the point source sound field in the pool by using the boundary conditions, and the calculated results are compared with the law of spherical wave expansion. The sound field characteristics of the water pool were measured by using the volume pulsating sound radiation of the underwater exhaust nozzle of the diesel engine as the sound source within the frequency range of the diesel exhaust and the common measuring point. This work has some guidance on the experimental research and theoretical prediction of diesel exhaust noise.