Based on the specimens of PYU,we studied the pteridophyte flora in Yaoshan Mountain Nature Reserve of Yunnan.The results indicated that there were 30 families,67 genera,177 species and 10 varieties in Yaoshan Mountain Nature Reserve.The genera of pteridophytes flora could be grouped into 10 types,and 11 sub-types.At species level,the pteridophytes flora could be grouped into 9 types,20 sub-types and 7 varieties.It was found that the temperate geographical floristic elements were predominant in this area.By comparing floristic components,Yaoshan Mountain kept the most closely relationship with Jiaozixueshan Mountain,secondly with Meilixueshan Mountain and adjacent regions,and then with Yulongxueshan Mountain,last with Huang Mountain.