On December 3, 2013, the Western Transportation Construction Science and technology project management center hosted the research project on standards, measurement and quality of the Ministry of transport in Wuhu "Review meeting of research results on standardization of water inlet and outlet system for diving and underwater operation". This project is a ministerial research subject jointly organized by our company and Wuhu diving equipment factory. This study summarizes the current situation and development trend of water inlet and outlet system for diving and underwater operation at home and abroad, analyzes the industry demand, finds out the gap with developed countries, and puts forward countermeasures to solve the gap. In conclusion In line with China's national conditions and considering the integration with the international market, the framework of diving and underwater operation inlet and outlet standard system has been constructed, and the diving cage and hoisting device of diving and underwater operation inlet and outlet system have been completed The research results have strong practicability and innovation, filled the domestic gap, and generally reached the international advanced level. It is of great significance to improve the safety performance of products, reduce the occurrence of diving diseases and accidents, and improve work efficiency, resulting in better social and economic benefits.