Abstract: In view of the relatively fixed general solution and standard solution of TRIZ substance field analysis in solving innovation problems, combined with the formalization and extension characteristics of element model, a substance field extension innovation method integrating element model and substance field analysis is proposed. Taking the general solution as an example, the basic element model and its extended analysis method of the substance field model and the general solution are established, the substance field extension solution process of the innovative problem is given, and the scope of the general solution to the problem is expanded. Finally, the forming element of oil-water annular flow is designed by using the material field extension innovation method. It proves that the material field extension innovation method is feasible to guide the product innovation design, and provides a reference for practical application.