To date, it is still heatedly debated that whether the exposed Sunda Shelf was covered by savanna or rainforest in the Last Glacial Period (LGP). A lot of palynological evidences revealed that large increase of non-arboreal pollen did not occurred on the southern South China Sea (SCS), and lowland and montane rainforest pollen were still predominant. Most of the herb-predominated pollen records occurred on the northern Australia, possibly indicating dispersions of herbs from current distribution centers. As a result, we advocated that inland and connected exposed Sunda Shelf around the southern SCS were covered by tropical forests rather than savanna during the LGP, although climate was drier then. This conclusion is not only supported by palaeoclimate-vegetation modeling, but also corresponds with most of the palynological evidences from South America. Current palynological records also showed the lack of palaeoenviromental reconstruction in Southeast Asia, including less pollen records and ambiguous correlations between marine pollen assemblage and its catchment vegetation.