This project belongs to the field of new energy application and environment.  Pressure-bearing components for ultra-low-temperature cylinders are special equipment that has developed rapidly in China in recent years. Its main storage media are liquefied natural gas LNG, liquid nitrogen, liquid oxygen, liquid argon and liquid carbon dioxide. The lowest temperature reaches-196 ° C, which has ultra-low temperature. It is flammable and explosive, and has a large filling capacity. It is widely used in new energy vehicles, liquefied natural gas ships, biopharmaceuticals, medical equipment, environmental protection and industry and other fields. Since there are no corresponding national standards for such products and the lack of corresponding comprehensive performance testing technology and equipment, this is a core technical problem for improving the quality of such products and government supervision. Therefore, starting from product development and technical characteristics, the project team proposed the type test items, test methods, technical indicators and judgment basis of the product for the first time. At the same time, it developed the first domestic set of special comprehensive performance inspection and testing for pressure-bearing components for ultra-low-temperature gas cylinders. The platform finally issued two technical standards for the first time. The main technical innovations of this project are as follows: Innovation point 1: In view of the special use conditions of ultra-low temperature globe valves, it is proposed for the first time to use the normal-low temperature pressure difference method to test the ultra-low temperature sealing performance, and a special ultra-low temperature test device is designed to avoid Various interference factors, and the practical operability is high, achieving quantitative and accurate measurement.  Innovation point 2: Aiming at ultra-low temperature service conditions, a fatigue performance testing platform in ultra-low temperature environment was designed and developed for the first time. The fatigue cycle test method and test times of the globe valve products at-196℃ and the highest working temperature of 85℃ were determined, and a set of testing technology and equipment to detect the fatigue performance of the globe valve through internal cooling of liquid nitrogen was designed and created;(2) According to the working characteristics of ultra-low temperature pressure regulating valves, it was finally determined that a total of 30000 fatigue tests were carried out using liquid nitrogen at three environmental temperatures: room temperature, 85℃ and-40℃ respectively;(3) The functional test and testing technology for pressure regulating valves for ultra-low temperature cylinders was proposed for the first time, and a set of testing methods and test equipment that can accurately test the product's pressurization and pressure reducing functions and fatigue tests were established.  Innovation point 3: A complete uncertainty evaluation model for instrument measurement results has been established, which can be used to evaluate the uncertainty of instrument measurement results. A method and system for evaluating sensor measurement uncertainty based on frequency characteristics were invented, and applied to the inspection and testing equipment developed in this project to effectively improve the accuracy and reliability of test data.  Innovation point 4: For the first time, the structural type, material requirements, design and process requirements, and type test technical requirements of ultra-low temperature bottle valves were proposed, and two national standards for ultra-low temperature bottle valves were promulgated, which have been promoted and used in China, effectively improving the quality level of such products.  Using the research results of this project, it has provided type test, inspection and testing services to more than 30 domestic and foreign manufacturing companies such as the United States, Luxembourg, the Czech Republic, Taiwan, and Zhangjiagang. It has provided technical support for my country's special equipment manufacturing license and shortened the development of enterprises. The time and cost of such products has effectively improved product quality, allowing my country to develop the first set of domestic ultra-low-temperature bottle valve products in 2014. Currently, domestic products have reached the international advanced level. It has solved the previous technical bottleneck of relying entirely on imports, filled gaps at home and abroad, and met the requirements of Shanghai City to carry out quality improvement actions and "Made in China 2025."  This project has comprehensively solved the problems of government supervision and quality improvement of pressure-bearing components for ultra-low temperature cylinders from research on key technologies for inspection and testing, development of test platforms, and compilation of national standards. It has obtained 2 invention patents and 11 utility model patents, and published 12 papers, promulgated 2 national standards, and trained 3 senior engineers.  After novelty search and level search, the results have reached the international advanced level.