Abstract:The pteridophytic flora of Mt. Gongga comprises 399 species, 93 genera, 40 families. Some phylogenically higher taxa including Polystichum, Dryopteris, Athyrium, Polypodiaceae etc. constitute the main body of the flora. From the view of phytogeographical point, the Himalayan species and those differentiated locality in Southwest China are most important for this pteridophytic flora. Moreover, the endemic genera (shared with the neighbour areas) it contains are mostly new endemic. Therefore, it can be said that the pteriophytic flora of Mt. Gongga is a young- er one which developed with the heaving of the Qingzang Plateau. The tropical taxa, containing more genera but less species, are companied by the North-temperate components in the higher part of the Mountain. Mt. Gongga, situated in the area through which many east and west distributing boundaries of the species pass, can be taken as the subordinate meriodinal boundary of the Polysticho-Dryopetris Floristic Region.