In order to research into invention phase of management innovation, the paper develops the twodimension model of invention phase of management innovation from the perspective of internal change promoter driving management innovation. Then it emphatically discusses types of new problems, sources of the problem driven search, and innovational backgrounds of internal change promoter in the model. Finally, combining with Enterprise Constitutionalism developed by Dawu Corporation, it demonstrates the model of invention phase of management innovation. The results show that invention phase of management innovation is the phase that internal change promotes do the problem driven search according to internal and external environment; new problems are reduced to organizational changes and perceived obstacles; the sources of the problemdriven search consist of market scope, market source, internal source, and professional source; external experience, acceptant training and network of internal change promoter are the foundations of management innovation. 