关键词: 外部环境；中美关系；新冠疫情；国际战略研究；中国外交  ,

Abstract: Accelerated changes of China's external environment should be dealt with prudence. This paper mainly puts forward the basic idea for analyzing and evaluating China's external environment, sorts out changes of external environment and development of China's strategy from 2008 to 2017, probes into the root causes of Chinas external environment changes and the direction of China's strategic adjustment since 2018, calling for strengthening strategic study to make sufficient preparations towards the changes. This paper renders that China has actively responded to external changes since the 2018 debt crisis in Europe and America. Taking joining the international system as the main path and giving impetus to international strategic innovation, China has expanded national strategic interests in a global sphere and maintained the dynamic stability and benign development of ChinaUS relation. Since 2018, drastic changes unseen in centuries, new US. strategy for China and Covid19 pandemic have combined to lead to drastic external environment changes. China should cope with challenges from the US. with prudence and adhere to selfreliance and meanwhile further openingup. Based in East Asia and surrounding regions,China should actively promote innovative combination of bilateral coordination and multilateral cooperation to achieve steady improvement to fits external environment. Current change of China's external environment breeds new opportunities for the development of international strategic disciplines, driving the arrival of the golden age of international strategic studies.The paper suggests that we should reinforce historical and comparative studies on China's external environment, promote theoretical innovation and propose workable solutions.

Key words: external environment, ChinaUS relations, Covid19 pandemic, international strategic study, China's foreign policy