Form innovation is a particular field in innovative theory and design methodology. In order to develop creative thinking and obtain innovative product form, it has been put forward in this paper that an effective and systematic design approach based on the features of form design. According to this method, form innovation is subdivided into innovation in functional attribute and visual style. Therefore, product innovative design can be implemented smoothly and efficiently by combining the effective innovative tools and the creative thinking. A case study, chair innovative design for fast-food shops, has been conducted to demonstrate the effectiveness of the approach proposed in this paper which will stimulate and systematize the creative thinking.