In order to realize the development of regional organization in South Pacific, we firstly try to offer some basic data about this area in this paper, then introduce several important regime, such as South Pacific Commission (now named Pacific Community, PC), South Pacific Forum (renamed Pacific Islands Forum, PIF), Forum Fisheries Agency, South Pacific Tourism Organization, etc. Because of the fact that most actor in the area belong to small countries and some major powers, such as United States, China, Japan, and Australia, began to adopt more aggressive policy, we also try to describe this tendency. Last, in the end of this paper, I focus on the inner cooperation among South Pacific countries, especially the items about disaster prevention, fishery cooperation, and the development of FTA.