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Species compositions in the mangrove habitats of China and India,especially on Hainan Island (China) and on the Sundarbans and the Andaman & Nicobar Islands (India),are of interest,showing several similarities and differences.The total mangrove areas of India cover about 6419 km2 with 43 species (23 major and 20 minor species),while the mangrove areas of China cover about 150 km2 with 26 speices (19 major and 7 minor speices).We carried out a comparison of mangrove floras in the Indian Sundarbans,Andaman & Nicobar Islands and in Hainan Island.The mangrove areas of the Indian Sundarbans comprise about 66.5％ of the total Indian mangroves,presently covering an area of 4267 km2 with 35 species from 22 genera and 16 families.There are 34 species from 17 genera and 13 families in the Andaman & Nicobar Islands.Hainan Island is considered a distribution center of mangroves; it has the largest number of mangrove species in China,i.e.,25 species from 15 genera and 12 families,accounting for about 96％ of the total number of mangrove species in China.The mangroves of Hainan Island and the Andaman & Nicobar Islands belong to island types,while those of Sundarbans belong to inter-tidal deltaic types.Differences in soil type,rainfall,temperature,tidal fluctuation and other climatic features possibly cause variations in floristic composition of these regions.