This paper summaries the institutional change of traditional institutionalism and new institutionalism, and discuss North¡¦s books: 1981, Structure and Change in Economic History¡B1990, Institutions, Institutional Change and Economic Performance¡B2005, Understanding the Process of Economic Change, figuring out the idea of north¡¦s institutional change? And how does his study influence new institutionalism of politics? Finally, I¡¦ll compare the institutional perspective of North, traditional institutionalism and new institutionalism. This paper researched by historical document analysis and comparative analysis. Studying North¡¦s institutional research in different period to outline his institutional perspective, especially in his late period. North focused on mental model of human being in his latest book, that¡¦s a rare way to research institutional change. By this paper, I hope to outline whole North¡¦s perspective of institutional change, and do a good comparison of North, traditional institutionalism and new institutionalism.