从特性关联入手分析并讨论更改传播,提出产品设计中特性关联单元的类型划分,论述特性关联单元的更改传播特征,进而归纳出更改传播的方式、更改传播展开过程以及特性在传播过程中的行为特性.所提出的工程更改传播过程模型为产品设计工程更改方案优化和传播风险评估提供了模型基础.通过气缸设计更改实例对提出的理论进行了初步验证. This paper analyzes and discusses the change propagation from the perspective of feature association, proposes the classification of feature association units in product design, discusses the change propagation characteristics of feature association units, and then induces the ways to change the propagation, changes the spreading process and the behaviors The proposed model of engineering change propagation process provides a model foundation for product design engineering change program optimization and propagation risk assessment.According to the example of cylinder design change, the proposed theory is preliminarily verified.