This text attempts to compare twp power elites how they obtain power within the historical framework of Han dynasty¡Aand how they got prosper within the political development of Han dynasty. That is, the political tradition and institution, how the two actors got close relations with the historical frames of Han dynasty. The historical institutionalism, being the school of New institutionalism, try to catch a clear mark of power elites and meaningful events, so we can have clear idea of Han history, because we are using a useful approach to study the political development of Han history. We think the most basic rule of ancient Chinese history is one man rule. Wang Mang use the popular concept of correlative cosmology, the school of yin and yang, to break one man rule of ancient Chinese history. But things are not exactly the same of eastern Han. Cao Cao has to fight to survive, because the rule of correlative cosmology was not working so well in eastern Han.