本文研究了知识在人类设计一切有目的活动中的行为，分析了设计中知识的流动和在竞争中的完整化即进化，论证了创新和设计的关系以及创新和设计的知识本质。提出了设计是以已有知识为基础、设计是以新知识获取为中心、设计知识具有不完整性、竞争性等基本规律和基本特征，认为要依赖创新推动经济增长方式的转变，知识行为研究应该是设计科学的重要命题。

The behaviors of knowledge in designing human purposeful activities are studied. The knowledge flow and the efforts in making the knowledge more complete via competition,  i.e. the knowledge evolution in design are analyzed. The relations between innovation and design and the knowledge essentiality of innovation and design are discussed. The study reveals that design is based on existed knowledge and centered on new knowledge acquirement. The study also gives the incompleteness and competitiveness of knowledge in design. Since innovation has been identified as a basic driving force of the mode transformation of economic development,  the behaviors of knowledge should be important issues to be studied in design science.