本文主要讨论特性表机制与复合对象的概念、功能及实现．在基于知识的面向对象系统中引入特性表机制与复合对象概念的目的在于增强系统的知识表达能力．文中提出的特性表机制包括了三种类型的特性说明表：类说明特性表、继承关系特性表和变量特性说明表．复合对象在系统中是通过引入一个称为“影子类”的新概念来构造和实现的． This article mainly discusses the concept, function and implementation of the property list mechanism and compound object. In the knowledge-based object-oriented system, the introduction of the property list mechanism and the concept of composite objects is to enhance the system’s knowledge representation ability. The feature table mechanism proposed in this paper includes three types of feature description tables: a class description attribute table, a inheritance relationship attribute table, and a variable attribute description table. Composite objects are constructed and implemented in the system by introducing a new concept called “shadow classes.”