The most conspicuous character of international relations in the 21st century is that the United States and China are G2 countries, which can be defined as an era through which they solve and manage global problems. Peace and common prosperity of the world are expected to be determined by whether the bilateral relations between the two countries will be harmonious with a developmental relationship or go into a conflict. In the United States, Donald Trump is elected president in 2016 and is promoting US priority . Which includes an international strategy to regard China as a strategic competitor and brings about full-scale trade dispute with China in 2018. China is also pursuing a strong China, such as the one-on-one project, when Xi Jinping appeared in 2012 as a national leader. In this process, the two countries show the aspect of conflict and confrontation over the hegemony of the international community. It is seen that conflicts and conflicts between the two countries will be surfaced in various fields such as the South China Sea problem, the Korean peninsula problem, and the internationalization of the yuan. This paper starts from the consciousness that the United States can raise the Taiwan issue as a card of keeping China in check between China (which is claiming one China and promoting unification with Taiwan) and Taiwan (which is trying to maintain the current situation separated from China). In fact, the Trump government is checking China by strengthening relations with Taiwan, including the issue of arms sales to Taiwan and the enactment of the National Defense Law. I would like to look at what the United States is strategically trying to get, and how China will respond, and the possibilities that can be developed in the future.