According to field investigation data, former research achievements and the latest research data in domestic, lichen flora composition and geographical components in Altay Mountain Tow-River Source Natural Reserve was studied and was compared with other ten regions in China. As indicated by the results, lichen floristic in Altay Mountain Tow-River Source Natural Reserve has several characteristics, including lichen species is abundant, dominant family and genus phenomenon is notable, distribution types are various and geographical elements are complex. Compared with other 10 regions, the results showed that the flora of this region possesses following characteristics that the north temperate elements including temperate zone and cireumpolar elements play dominant role, at the same time including east Asia elements and has significantly number of species endemic to China, the lichen flora of this region is ancient.%根据实地调查数据,利用前期研究成果和国内最新地衣区系研究资料,对阿尔泰山两河源自然保护区地衣区系组成和地理成分进行了研究,并且与国内10个地区的地农区系成分进行了比较分析.结果表明,阿尔泰山两河源自然保护区地衣区系地衣种类较丰富；优势科属现象明显；分布类型多样,地理成分复杂.同时,与国内其他地区相比,该地区地衣区系中温带成分占优势,环北极成分较明显,世界广布成分较多,同时与东亚成分保持联系,含很少的泛热带和两极成分；区系具有一定的古老性特点.
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