Abstract:Tibet boasts of a rich and complex Pteridophyte flora, consisting of 44 families, 113 genera and about 470 species to date. They are concentrated in the south-eastern part and the southern flank of The Himalayas. Their distri-bution patterns frequently correspond to those of the forests in Tibet, as they are usually found in association with forests and other ligneous plants of various kinds, whose canopy may perhaps serve as an effective protection during the long winter season. However, their horizontal distribution is insignificant as they are nearly confined to a narrow belt including the south-eastern part of Tibet and the southern flank of the Himalayas.