Abstract: Xiaolong Mountains there were 2400 species of seed plants belonging to 150 families and 805 genera.The large familiesof plants (100 species) there were Compositae、Rosaceae、Gramincae、Papilionaceae, 50~100 of plants there were Ranuncuaceae、Liliaceae、Umbelliferae、Cyperaceae、Labiatae、Caprifoliaceae and the quality of them mostly is temperate.There were 15 distribution type of genera of seed plants in Xiaolong Mountains.It was dear from the figures that North temperate elements play an important role in the flora and vegetation with characteristics of the Temperate Zone to the flora.In addition the abundant monolypic species and oligotypic species and relic endemic to China also indicated characteritics of ancient in origin.

Key words: Xiaolong Mountains, plant flora, seed plants