| With the rapid development of software technology and Internet, It is more and more unsuitable for the two-tier Client/Server structure to meet the requirement of distributing, expansibility and heterogeneity in enterprise computing. Because the business logic of three-tier or multi-tier system framework is separated from the Client layer, the expansibility and transplantation of the system is increased. Now, this framework is applied in more and more enterprise systems. How to divide the express-tier, the business-tier and the data-tier has become the key in the enterprise application system.On the other hand, people use computer to solve more difficult problems in more and more fields, so the size and the complexity of software increase gradually. To exploit a complex distributed system is a quite difficult project, and the layout and the design of the system is more important than the given arithmetic and data structure. Software system structure as the important method of senior design and software reuse has become a new hotspot in the research of the software project.The paper gives emphasis to combine OOA, OOD and Distributed system to build an enterprise MIS which is easy to expend and convenient to transplant. In the paper, how to establish mappings from static model to database system and distributed object is summarized.Firstly, the shortage of traditional Client/Server system is discussed in the paper and the multi-tier distributed system and relative technology are inducted. Secondly, the characteristic of three popular distributed object models are compared and the EJB is introduced particularly in the paper. And then, the author uses the OOA/OOD to analyse and implement an actual project. In the project, author use the UML to describe the system model.The combination of OOA/OOD and distributed technology in a project is discussed in this paper, so it is a reference for building a multi-tier distributed system.
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