The US policy toward China has undergone major changes recently,and the China-US relations are experiencing the most profound transformation since the establishment of diplomatic ties between the two countries.The transformation of China-US relations is accompanied by risks and challenges in many aspects,but it also reflects the trend of world development.On its way of major-country diplomacy with Chinese characteristics for the new era,China faces a major task to analyze the driving force,nature and trajectory of its relations with the US,and understand and properly manage the risks and challenges in the bilateral relationship.It is of great significance for China to actively shape a favorable external environment and safeguard the important period of strategic opportunity for its development.