Abstract: Rhizophora stylosa, Heritiera littoralis and Lumnitzera racemosa are the new records of geographical distribution of the mangrove floristic composition in the coast district of east Guangdong. In the mangrove of this coast district, there are 13 families, 20 genera, 20 species, making up 24% of the total species of mangrove of the world, less than Hainan Island but almost equal to west Guangdong. It shows the physiognomy and structure of shrubland and forest. According to the floristiccomposition, physiognomy, structure and characteristics of habitat, it may be divided into two types: beach-mangrove and coast-semi-mangrove and seven formations.The distribution of mangrove in the coast of east Guangdong indicates the situation of the mangrove of this district in the geographical distribution of mangrove in the world and the tropical character of vegetation and the transition of vegetation from tropics to subtropics in this district.