Abstract: This paper discussed two problems concerning with the mangrove as follows:1. The distribution of mangrove species in the world was described. In which, there are 81 species belonging to 30 genera in 24 families.2. The composition of mangrove in the southeastern coast of China including Taiwan and Hainan Islands was described.Among them, there are 31 species, that is Acanthus ebrecteatus, A. ilicifolius, Acrostichum aurenm, A. speciosum, Aegiceras corniculatum, Avicennia marina, Barringtonia raeemosa, Bruguiera cylindrica, B. gymnorhiza, B. sexangula, B. sexangula var. rhynchopetala; cerbera manghas, ceriops tagal, Excoecaria agallocha, Heritiera littoralis, Hibiscus tiliaceus, Kandelia candel, Lumnitzera littorea, L. raeemosa, Nypa fruticans, Pemphis acidula, Rhizophora apiculata, R. mucronata, R. stylosa, Scyphiphora hydrophyllacea, Sonneratia alba, S. caseolaris, S. hainanensis, S. ovata, Thespesia populnea and Xyiocarpus granatus.