Abstract: The Cupressus chengiana S.Y.Hu is one of national Ⅱ level protected species,mainly distributed in the basins of the Minjiang,Dadu and Bailong Rivers in China.Based on the disturbance type and intensity,C.chengiana forests were divided into severe,moderate and mild disturbance types,respectively.In order to answer the affects of different disturbance intensity on C.chengiana ommunity characteristics,analysis was made of species diversity and important values under different disturbance types.The results showed that under the severe,moderate and mild interference intensity,the species of C.chengiana forests consisted of 30,43,and 50 species respectively,and the different interference intensity had a significant effect on C.chengiana community species diversity (P<0.05).Under heavy,moderate and mild disturbance,the importance values of tree layer in Cupressus chengiana were 256.09、154.09 and 116.19 respectivehy.The important values of shrub layer in Cupressus chengiana seedlings and saplings were 107.08,5.44 and 29.27,being higher than those of other species.The studies have shown that human disturbance has a significant influence on Cupressus species diversity composition.