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从目标方案的修改需求入手，剖析面向对象（ＯｂｊｅｃｔＯｒｉｅｎｔｅｄ，ＯＯ）的知识表达模型，提出用基于两个层次的约束网络模型作为ＯＯ模型的补充，描述了对象间的约束关系及对象内部属性间的约束关系。结合工程实际，提出了简明因果关系图的生成方法，建立了变量敏度关系图，使属性间约束关系的描述定性化及定量化，以便用户对目标方案的修改
This paper analyzes the object-oriented (OO) knowledge representation model from the modification requirements of the target program, and proposes that the constraint network model based on two levels be used as a supplement to the OO model, describing the constraint relationship between objects and the internal properties of objects Constraints. According to the engineering practice, a method of generating a concise causal graph is proposed, and the relationship between variables’ sensitivity is established. The description of the constraint relation between attributes is qualitative and quantitative, so that the user can modify the target scheme