This paper introduces the principle of ultrasonic thickness and its unique advantages,analyzes the ultrasonic thickness of material selection and preparation matters,and the different materials were compared. Through this method, precise thickness can be measured on cast iron cylinder.Finally ,it summarizes the development direction of ultrasonic thickness measurement technology.%本文介绍了超声波测厚的原理及其特有优势，说明了超声波测厚的材料选取及准备事项，将各种材料进行了比较。通过此方法，可测得对铸铁烘缸较精确的厚度。最后总结了超声波测厚技术的发展方向。
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