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Design sketch is at the core of the product design process. How to use design sketch to express design concepts and develop creative thinking, is the key point in design sketch teaching. Firstly, the definition, classification and function of design sketch are explained. Secondly, its importance in the product design process is analyzed. Then design sketch is compared with computer rendering. The uncertainty of design sketch is presented to reveal its ambiguity. Thirdly, the relationship between the ambiguity of design sketch and creative thinking is discussed. Finally, the teaching points of design sketch are proposed from two aspects of presentation techniques and training contents. Appropriate drawing tools and techniques should be chosen according to the characteristics of different stages of the design process and progressive training should be insisted on, so that design sketch can really serve as a primer for the successive courses of product design.