利用超声波在不同浓度、不同温度的盐水溶液中传播速度不同这一特性，测出盐浓度Ｓ、声速Ｖ和温度Ｔ之间的关系，绘制不同温度下的Ｓ－Ｖ曲线和不同浓度下的Ｖ－Ｔ曲线，用计算机对实验曲线进行拟合，给出相应的多项式回归方程。模拟计算结果十分接近实验结果。该方法测试简便，精确度高。 The relationship between the salt concentration S, the sound velocity V and the temperature T was obtained by using the ultrasonic wave propagation speed in different concentrations and different temperatures of brine solution. The S-V curves at different temperatures and the V -T curve, using computer to fit the experimental curve, give the corresponding polynomial regression equation. Simulation results are very close to the experimental results. The method is simple and accurate.