In the early postwar period，there were four aspects of social disorder in Japan. In terms of social psychology，the “kyodatsu” condition among the general public was a common phenomenon. In terms of material supply，food shortages coexisted with the black market boom. In terms of social life，the emergence of “panpan” caused a great shock to all sectors of society. As for cultural trends，the new “kasutori culture” constituted a special subculture. Meanwhile，with the occupation of the American forces and the implementation of various reforms，Japan gradually get rid of its social disorder and sought to transform itself. Political reforms led to a shift from a wartime militarism system to a political democracy. Economic reforms led to a shift away from the wartime munitions-based economic system. Religious and cultural reforms laid the foundation for the development of culture and education in postwar Japan. Judicial reforms were aimed at urging Japan to strengthen its laws and regulations. Many of the U.S.reforms in Japan contributed to a certain extent to the demilitarization and democratization of Japan，but the rapid shift in policy in the later years hindered that process.