Abstract
As a former British colony, Hong Kong's political system differs significantly from the Chinese Mainland. After Hong Kong's (HK) return, the Chinese central government adopted the policy of "one country, two systems" to cope with the differences in the political systems of the two places, hoping to find common ground while reserving differences for future development. Nonetheless, this policy and excellent ideas have been severely impacted due to a series of wars. In Hong Kong, the one country, two systems policy has encountered numerous obstacles, and the political system of the Chinese Mainland has also been affected. This study will compare and analyze the Chinese Mainland and Hong Kong political systems from the standpoint of the fundamental law, policy documents, history, and the humanities. This study analyzes the historical, sociological, and geopolitical factors contributing to these frameworks and identifies their primary differences and similarities.