This study evaluated China's model of “One Country, Two Systems” (一國兩制) 20 years into operation and the bilateral relationship between Taiwan and Mainland China ‒ focusing on Hong Kong, Macau, and Taiwan ‒ and examined future prospects. The study is meaningful in that it conducts a more objective evaluation than the previous studies by empirically analyzing data accumulated over the past 20 years of implementation of the One Country Two Systems principle from various perspectives. In addition, it is also a timely study in that it analyzes how the One Country Two Systems arrangement is likely to develop in the future, and what impact this would have, making considerations for changes in China's national strategy during the Xi Jinping period and the competition for hegemony between the U.S. and China.