For the usability problems of innovation product design

it put forward the coupling theory from the angle of user centered design

and analyzed the multi-field coupling relationship between designers and users in function coupling

man-machine coupling and information coupling

which exists in the product innovation design. Through analyzing the transformation of the user's cognitive psychology into the designer's psychology

it elaborated the basic thought of using the knowledge coupling method to obtain the multi-field coupling relationship. Lastly

it discussed the relationship between coupling theory and microscopic innovative methods (such as Quality Function Deployment，QFD) in the designing process.