This paper deeply discussed consumer kansei system and demand, based on Kansei Engineering system; it researched method of product system design. This method used application theory of Kansei Engineering: consumer decision-aid system and designer decision-aid system, which investigated consumers' preference adjectives in terms of kansei image, then used product system design, and outputted corresponding specific form of product system. On the other hand, product system designed by designers would induce the awareness of consumers for products, thus it affected consumers' preferences, finally it worked out with product system which matched with consumer demand, and guided follow-up product design. With the increasingly fierce market competition, consumer market has changed from the previous sellers' market to buyers' market, and product system design based on consumer demand-oriented system is increasingly in the lead. Designers must dig out the potential emotional needs of consumers and create product system which matches with consumers' demand. Using method of product system design is an effective approach to develop products in company. Therefore, if the designers can understand the psychology of the consumers and explore the emotional system and consumer's needs deeply, they can develop a good product system successfully ([1]).