The dark coniferous forest was distributed between 1100m and 1850m in the subalpine of Changbai Mountain,and the distribution pattern of species composition along elevation gradient in dark coniferous forest on north slope was sampled and analyzed in this research The α and β diversity were used to measure the community diversity of the forests,and community coefficient,which was one kind of β diversity in essence,was used to analyze the similarity of species composition between the communities or plots B...