中文摘要：

针对产品数字化设计过程中知识重用的特点，对设计知识进行了比较全面的分类，提出了产品设计过程中多形态知识的概念。研究了多形态知识集成的方法，给出了基于领域本体的多形态知识融合方法，并以螺纹滚丝机设计中多形态知识为例，对该方法进行了解释，得出了相关结论。

英文摘要：

The state of art of knowledge reuse and categorization of design knowledge is discussed in this paper. First, the different knowledge types are analyzed according to the character-istics of knowledge reuse in the design process. The concept of multi-style knowledge is proposed to describe the different knowledge styles in the digital product design. The method of knowledge merge based on domain ontology is given following a study on knowledge integration. Finally, application of the method is interpreted with a case study of knowledge reuse in the design of a screw rolling machine.