The standard "ISO/TS 19397-2015 Determination of Film thickness of coatings using ultrasonic measurement meters" specifies a method for measuring film thickness of coatings using ultrasonic measurement meters. This method is based on the principle of ultrasonic propagation between coatings and substrates, and the film thickness of the film layer is calculated by measuring the reflection time of ultrasonic signals. This technique is particularly suitable for non-Destructiveness detection of surface coatings of metals, Pottery and porcelain and Miscellaneous materials. The standard provides specific requirements for operation steps, instrument requirements and measurement accuracy, providing reliable technical support for coating mass control and process optimization. This method is widely used in manufacturing, maintenance industry and coating technology research.