Abstract:The niche characteristics of 13 main species in Cinnamomun micranthum forest, including niche breadth, niche similarity proportion and niche overlap, were studied by the quantitative investigation method in Wanmulin Nature Reserve of Fujian Province. The results showed that most dominant species in the C. micranthum forest had wide niche, in which the niche of C. micranthum population was the widest with absolute dominant in diameter class, it indicated C. micranthum had strong ecological adaptability in community. The niche similarity proportion among different species was at high level, of which the species with niche similarity proportion above 0.5 reached 44.9%. The niche overlaps between C. micranthum and other broad-niche-breadth species were high, most from 0.05 to 0.10. It suggested that C. micranthum could adapt habitat and formed mixed forest with other wide-niche species at present.