Abstract: This paper not only elaborates the conception、function and operation in the reusable applied system of multi-heterostructure Data Source of middleware but also analyses and compares the middleware of distribution Data Base,such as ODBC、BDE/IDAPIT、OLE DB/ADO and JDBC,and some other middle-wares like CGI、ISAPI/NSAPI、ASP、JSP etc,based on the analysis of the development and change of distribution applied system.At the same time,this paper gives the practical examples of the operation of the middleware technology in the administration information system.