In 2021，Pacific Island countries are still facing the severe challenge of COVID-19，and some countries have been hit hard by the epidemic. International cooperation against COVID-19 and seeking external medical and economic assistance have become the priority of their diplomacy. At the same time，as direct victims of global warming，Pacific Island Countries have，through active diplomatic means，promoted the world to continue to pay attention to the climate issue while responding to the epidemic，and adopted practical measures both within and outside the region to demonstrate their resolve and cohesion in tackling the climate challenge. In 2021，the change of the secretary general of the Pacific Islands Forum led to the withdrawal of the five countries from the Forum，and the development of regionalism suffered a setback. However，there is still broad consensus among countries on addressing challenges such as COVID-19 and climate change. At the bilateral level，the traditional relations between Pacific island countries and Australia and New Zealand continue to develop steadily，and their relations with Japan have been upgraded. Both China and the U.S. are increasing their input to the Pacific island countries. While promoting bilateral relations，the Pacific island countries strive to maintain their independent self-determination and avoid being drawn into the game of great powers.