To use reasoning knowledge accurately and efficiently,many reasoning methods have been proposed.However,the differences in form among the methods may obstruct the systematical analysis and harmoniousintegration of them.In this paper,a common reasoning model JUM(Judgement Model)is introduced.According to JUM,a common knowledge representation form is abstracted from different reasoning methodsand its limitation is reduced.We also propose an algorithm for transforming one type of JUMs into another.Insome cases,the algorithm can be used to resolve the key problem of integrating different types of JUM in onesystem.It is possible that a new architecture of knowledge-based system can be realized under JUM. To use reasoning knowledge have and efficiently, many reasoning methods have been proposed. Yet, the differences in form among the methods may obstruct the systematical analysis and harmonious integration of them. This paper, a common reasoning model JUM (Judgment Model) is introduced. According to JUM, a common knowledge representation form is abstracted from different reasoning methods and its limitation is reduced. We also propose an algorithm for transforming one type of JUMs into another .Insome cases, the algorithm can be used to resolve the key problem of integrating different types of JUM in onesystem. It is possible that a new architecture of knowledge-based system can be realized under JUM.