[Purpose/significance] Data circulation and sharing is the pillar of global data economy development and the key of technological innovation, and it is also one of the important contents of actively participating in the reform and construction of the global governance system and practicing the global governance concept of consultation, co-con? struction and sharing. How to solve the trust obstacle in the process of data circulation and sharing is an important issue to promote the construction of China's data factor market. [Method/process] This paper focuses on the data intermedi? ary service proposed by the Data Governance Act, sorts out and summarizes the concept connotation, form and concrete practice of the new data sharing mechanism in the European Union, and provides reference for the practice of data ele? ment circulation and sharing in China. [Result/conclusion] The article puts forward that China can improve the toplevel policy design, eliminate trust barriers in data circulation and sharing, and develop diversified data intermediary services to promote the market-oriented circulation of data elements.