The year 2021 is an extraordinary year in the history of the Pacific Islands Forum（PIF）. Five Micronesian states have announced that they will withdraw from PIF following the election of former Cook Prime Minister Henry Puna as the new secretary general，causing shock in the Pacific Islands region. Will the forum split？What impact will these differences have on the development prospects of PIF？This paper attempts to draw a conclusion by analyzing and discussing the background，operation mechanism，development vision，election process of the secretary-general of PIF and the problems exposed thereby：On the one hand，such differences have arisen in the course of the forum’s development and are inevitably caused by the unbalanced development of the Pacific Island countries. On the other hand，with the experience of PIF and the wisdom of its leaders，disputes among member states arising from the appointment of the Secretary-General will eventually be properly resolved.