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.