With the continuous development of the digital economy,data,as a new factor of production,has become an important driving force for social progress and economic growth.As a bridge connecting data suppliers and demanders,data brokers play an important role in promoting the circulation of data.By analyzing the challen-ges faced by data circulation,this paper discusses how data brokers solve the difficulties in data circulation through market supply and demand mechanism,price discovery,competition and cooperation,and their own technical means.Combined with the mechanism of data brokers to promote data circulation,this paper puts forward that data brokers can promote data security,efficient and credible circulation from three aspects:"helping data to be shared","promoting data to be easily entered into tables",and"ensuring data to be true and complete".