Abstract: The concepts of "technical features" in the legal system of patent and of "features" in the Extenics are introduced, and the differences and connections of "features" between the two are analyzed. A product invention patent claims for "the seating furniture" was used as an example. First, the Extenics Basic Element Theory was used to disassemble and analyze each product invention patent claim. Next, the basic element model of each patent technical feature was established. Then, the basic element model of each patent technical feature was expanded and transformed by the Extenics Innovation Four-step Method. Finally, the best creative program was selected. The aim of this analysis is to initiate an application of the Extenics Innovation Four-step Method in the field of legal protection through interpretation and better understanding of the "features", and thence to highly develop the utilization of Extenics in the marketing economy performance.