Abstract: After World War Ⅱ, Japan's macroeconomic policies theories transition and alternation not only presented the trait of inheritance from tradition but also showed the reform and enrichment of the tradition from 1945 to 1990. In Japan, three traditional macro economic theories:Keynesianism, Neoliberalism and rational expectation school are successively amended and improved after entering the recovery period. In dominant period of each theory, the relationships among these three theories were expressed as mutual exclude and overlapping. Japan's history itself and economy characteristics of real economy could explain the reasons for the phenomenon. The research on the transition and alternation of Japan's macro economy theories is intend to clarify the laws when the theory system was affected by the external and comply with the law to ensure the normal working of the economic system. According to characteristics and track of the Japan's three macro economic theories,it is expected that three macro theories would keep the trend of continuous development, which is the presentation of reversion of things development and it is not a simple return but the negative negation. In order to keep Japan's economy system normal operation, it is needed to strengthen the coordination between the fiscal policy and currency policy; government should establish a reasonable policy law for a stable expectation instead of discretion of fiscal policy and currency policy; when there lies contradiction between the international policies coordination and domestic policies goals, autonomy and rational countermeasures should be taken.

Key words: Japan, Keynesianism, Freedman, rational expectation school, macro economy theory