Abstract: It is now known that there are 558 species (including varieties) of fern in Jiangsu,Zhejiang and Anhui Provinces, which belong to 119 genera and 49 families.The floristic elements showed that the pteridophytic flora of these provinces are of temperate and tropical features.The areal types of E. Asia are absolute predominance.The endemic species have been formed evidently in south Zhejiang.The fern of North Anhui and North Jiangsu are poor.South Zhejiang Mountains,combined with East Jiangxi and North Fujian,is the richest region of fern flora in East China.