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介绍了PSFD－E的结构及各功能模块的设计，并且用面向对象的方式来构造规则库，利用类的封闭性和继承性，提高了规则的可重用性和专家系统的可维护性。在实际应用中取得了令人满意的结果。
The structure of PSFD-E and the design of each function module are introduced. And the rule base is constructed by using the object-oriented method. The closedness and inheritance of the class are used to improve the rules reusability and the maintainability of the expert system. In practical application has achieved satisfactory results.