The high-resolutional analysis of the content of total organic carbon (TOC), total nitrogen (N) and TOC/N ratio, together with other climate proxy analysis from core SC-1 in Maar Lake Shuangchi in Hainan Island has been made to reconstruct the tropical climate changes since the Last Deglacial period. The Holocene Megathermal began at 7 400a BP，and ended at about 2 700a BP. During the time, climate was warm and humid; vegetation flourished in the tropics, and the evaporation was equal to the precipitation. So the Maar Lake Shuangchi became a swamp in most of the time. But there still existed fast climate changing events in the Holocene Megathermal. During the time of 7 200a BP, 7 000a BP, 6 000-5 900a BP, 4 300-4 000a BP, the productivity of organic mater had remarkable low values, showing that the weather was cool. Before and after the Megathermal (8 000-7 400a BP、2 700-2 300a BP), the climate condition was cool with frequent seasonal strong storms, which demonstrated the climate pattern changing. At that time, Evaporation was less than precipitation, and the Maar Lake was in its deep-water time. Consequently, the land-area around the lake decreased, beside with the relative cold temperature, leading to the low productivity of vegetation and the low content of organic matter in the core.
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