在实践中，开发DSS系统往往是一个庞大的工程，系统开发费用的控制、开发效率的提高、软件质量的保证、软件开发一致性及软件可靠性的保证等显得非常困难，这就要求有一个完善的方法库的有效支撑。从方法库的可重用性出发来解决上述问题，将方法的可重用性分成了程序代码设计和模型构造这两个层面上的可重用性，使用面向对象的OOM和OOP方法，根据具体算法本身的逻辑结构，建立了方法库中方法的程序代码的可重用结构，给出了方法库的‘类层次’结构；同时通过关系数据模型来管理方法从而达到了在模型库中重用方法的目的。

In practice, it is a huge project to exploit DSS and very difficult to control expense of exploiting DSS, raise efficiency, and to ensure software'squality and reliability. Then a perfect methodsbaseis required. Recycling methods base can solve questions above. This kind of recycle contains two respects: recycle of programcodes and recycle methodsin building model.Based the logic structure of arithmeticand using the technology of OOM/OOP, the recycle of programcodes of methods is established. The structure of methods class library's arrangement and their relation map are gotten, at the same time relation data model manage methods are used in order to recycle methods in models base.

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