In 2021，with the continuous spread of global COVID-19 pandemic and the growing competition in big countries，the “vulnerability” characteristics of the sustainable development of the Pacific Island countries overlapped with the “uncertain factors” of the external environment. A series of problems and challenges have emerged in political and economic situation，such as the traditional security risks，frustrated “regionalism” of the Pacific，the contradictions between political parties，and weakening economic recovery. Facing different challenges，Pacific Island countries，on the one hand，took positive measures domestically to prevent and control the pandemic，boost the economy and ease contradictions. On the other hand，they took the initiative to speak in international organizations and enhance their international influence. Meanwhile，as the Belt and Road Initiative developed，the connotation of China’s comprehensive strategic partnership with the Pacific Island countries is constantly enriched，which brings new impetus to the regional stability and development.