International situation and global challenges have become more complex and severe from 2020 to 2021. Sino-US relations have not improved since the Biden administration came to power，and the trend of domestic political polarization in the US has moved Sino-US relations toward full-scale competition and even confrontation. Beyond the US-China relationship，the international community is still under the shadow of the pandemic，and the stability of the global economic and security order is facing many challenges. Regional instability has intensified，cutting-edge technologies are being used in armed conflicts，Russia-West relations，the situation in Afghanistan，public health governance，global climate change and international cyber security and other issues have brought great uncertainty to international stability. Think tanks and research institutions in various countries have paid close attention and put forward their own analysis and recommendations. In order to track the latest research updates of top international think tanks on related issues and to gain a more comprehensive understanding of relevant hot issues，this article takes the top-ranked international think tanks in the “2020 Global Go To Think Tank Index Report” as the research objects，and compares the relevant research outcomes published by them in the past year.