| Nowadays, the information systems have become increasingly complex, multiplex and interacting. The traditional function-oriented methods of development cannot fit in with the complexity and inconstant requirements, and the result of analysis and design cannot be reused effectively. By comparison, object-oriented modeling technique is flexible, reusable and can reduce the risk of development because it makes the complexity and changeability in control. So object-oriented technique can improve the efficiency of software development. And UML is a standard language for software systems. So the transformation from function-oriented methods to object-oriented methods is inevitable.The paper explains the object-oriented system analysis and design based on UML with its application in the system and the database model design.The text has four parts. The first chapter summarizes UML, including its development and content. The second one introduces UML in details, including the main kernel concept and the modeling-tool. In the third chapter, I introduce RUP. At last, using an example explains UML' s application.
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