Abstract: Extension creation method is an important product innovation method, but there may be some deficiencies in the development path. Th third creation method is taken as the research object, the evolution tree of TRIZ theory introduced as the route of primitive expansion, the evolution tree of primitive expansion constructed, and the product shortcomings of integrating system level and time enumerated, and the specific cases in the socket innovation given. The improved creation method has clear shortcomings of mining and factor expansion path, thus reducing the confusion when expanding and improving the efficiency of expansion.