文章从交易成本、规模经济和范围经济的理论 ,分析了电子商务环境下 ,电子中介存在的合理性 ,介绍了电子中介的新功能和作用 Based on the theories of transaction costs, economies of scale and economies of scope, the article analyzes the rationality of electronic intermediaries under the environment of electronic commerce and introduces the new functions and functions of electronic intermediaries