To investigated the vascular floristic characteristics of Baishilazi Natural Reserve in China,we conducted plot survey,diversity index,correlation analysis and cluster analysis.Our results showed that:(1)1 056 species of vascular plants (442 genera,114 families) were recorded in Baishilazi.It is abundant of species and notable in dominant family and genus phenomenon.The flora is ancient and has not obvious phenomenon of endemic species.The dominance of temperate elements is obvious and tropical elements are less.(2)Compared with adjacent mountains,floristic Shannon-Wiener index are obvious differences,while simpson index are not.Shannon-Wiener index of Mt.Tai and Mt.Culai are quite high,while the others are not.(3)According to the relativity of flora from different mountains,their correlation is significant at the 0.01 level,and the coefficients are between 0.835 and 0.994.Cluster analysis deduces that boundary of Changbai flora and Huabei flora is located between Baishalazi and Fenghuang Mountain.Vegetation should be protcted in order to make a good habitat environment for sustainable development and region ecological security.