Abstract:   In this paper, by compared with the TRIZ, it shows that the extension innovation method has advantage in both universality and operability. After the systematic methodology and basic characteristics of extension innovation methods are introduced, the progress made in both research and applications is reviewed. Then, it is pointed out that, with further improvement, the extension innovation methods can provide operable methods for innovative activities of all fields. Thus, the extension innovation methods have its practical value for the formal and quantitative research in technical innovation and invention.