Although prestressed technology has only been applied in practical engineering in China for over half a century, it has been widely used and the number of applications is increasing due to its advantages such as structural safety and reliability, material saving, small self weight, good crack resistance of components, and high stiffness. This paper briefly describes the patent Document retrieval work of the prestressed industry, analyzes the overall trend of patent applications, patent category composition, trend comparison and other information, and provides data support for the development and innovation of the prestressed industry and patent strategy analysis