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.