he National People's Congress established a special administrative region in accordance with Article 31 of the Constitution of the People's Republic of China, and created a governance system that is quite different from that of the Mainland. The reason behind it lies in the central government's implementation of Hong Kong and Macau's comprehensive governance power, and in line with the unique history of Hong Kong and Macau. "One country, two systems" is a country that allows a high degree of autonomy in different ideological areas and implements constitutional segmentation management. It is considered a great theoretical and institutional innovation in world history. For reference, some people have proposed the view that Hong Kong and Macao are city-states from a "high degree of autonomy" in an attempt to blur the relationship between the Central Government and the Special Administrative Region. This article attempts to outline the relationship between the power of central governance and the high degree of autonomy of the Special Administrative Region from the perspectives of historical research and legal theory. <<