The community characteristics of Fagus hayatae and species diversity in Micangshan Nature Reserve (32°29′-32°41′N,106°24′-106°39′E) of Sichuan were studied on the 20 m×30 m forest plots.The results indicated that:(1)there were 129 vascular plant species belonging to 83 genera and 48 families in the F.hayatae community and Rosaceae was the dominant family.The north temperate,pantropic and east Asia-north America disjuncted distribution were the dominant floristic distribution types,which had the characteristics of the north and south.The main life-form spectrum distribution was Phanerophytes (61.16%) and Geophyta (23.14%),with relatively fewer other life-form spectrum,which was consistent with the geographieal location of F.hayatae community distributed in Micangshan Mountain.(2)F.hayatae was the single dominant species,and its important value was 42.37%.The Shannon-Wiener index of the shrub layer in the community was 0.97,significantly higher than that of tree layer and herb layer,which reflected the abundance of species in shrub layer.(3)In age structure of F.hayatae population,the individual of Ⅰ and Ⅱ occupying 24.05%,Ⅳ and Ⅴ accounting for 54.81%,which showed the poor natural regeneration in the population.(4)The community structure similarity analyses showed that F.hayatae communities could be divided into 4 groups with significant differences in species composition.The results showed that the characteristics of F.hayatae community and species diversity in Micangshan Nature Reserve have obvious regional features due to the inland.