The Constitution prescribes that the NPC( National People’s Congress) is the supreme institution of authority, vested with national legislative power. Also, according to the Constitution, the NPC is vested with the power to establish special administrative regions and to prescribe the systems for such regions. Therefore, both the establishment of the Hong Kong Special Administrative Regions (HKSAR) and the high degree of autonomy enjoyed by the HKSAR stem from the exercise of sovereignty by the Central Authorities derived from the powers of the Constitution.