UML Modeling Mechanism Based on Layered Structure of Abstraction

This paper introduces UML(Unified Modeling Language) modeling method. Based on the experience of traditional software development method and the analysis of traditional three layered structure of abstraction in UML, two ideas of abstraction and decomposition are brought forward as the kernel modeling ideas of UML to construct the abstraction modeling mechanism of UML that generalizes the process of computer system into the process of picking up five cells:the function cell. the structure cell, the service cell, the implementation cell and the integration cell. The purpose is to make use of the whole semantics of UML effectively and to get over the limitation of traditional OO method and eventually to achieve the perfectly transition from requirement to analysis and virtual separation of function and implementation.