提出一种更加实用的诠释声速测量实验原理的方法. 通过微小面元积分方法推导出接收端的声压，与球面波和平 面波为声源的模型推导出的声压进行对比. 在探头尺寸相对于传输距离不能近似于无穷大也不能忽略不计，实验测量误差较 小的距离内，通过面源积分方式推导的声压随换能器之间距离演化趋势更加接近实验测量数值.理论计算与实验数据差值较 后两种常见模型减小约10 倍以上，能够更加真实地反映声场传播规律.

A more practical method to demonstrate the principle of sound speed measurement experiment is proposed. Sound pressure of received side is deduced from the method of small surface element integration. Sound pressure obtained from spherical wave and plane wave source are calculated for comparative study. Compared with the size of the transducer，the distance between the transmitting end and receiving end can not be regarded as infinitely great or infinitely small. In this specific measurement range，the tendency of pressure change with respect to distance obtained from the proposed method is closer to the data measured from experiment. The difference between calculated and measured data is also reduced to less than 1 /10 compared to the last two modes.