In 2021，the COVID-19 epidemic continues to rage，and the 100-year changes have become more intense.Unilateralism，protectionism and hegemonism are on the rise，and the international system is facing a crisis.Standing at the historical height of leading the progress of mankind and upholding the vision of a community with a shared future for mankind，China participates actively in major multilateral and bilateral international conferences，elaborates on its propositions on the international system，issues joint declarations，statements and communiques to protect biodiversity，address climate change，cooperate globally to fight COVID-19，improve global governance，and lead the direction of international system development.China negotiates and signs actively treaties and strengthens the legal foundation of the international system.