Abstract: Based on the background survey data of Yunnan Longquan National Forest Park, the diversity characteristics of seed plants in the forest park were analyzed from the aspects of composition characteristics, composition proportion, protected plant species, plant life forms and flora. The results showed that there were 501 species of seed plants in the forest park, belonging to 352 genera and 114families; Gramineae, Compositae, Leguminosae and Rosaceae are the four families with a large number of genera in the seed plants of the forest park, and they are important components of the plant diversity of the forest park; the life form of seed plants in the forest park is dominated by high bud plants, accounting for 59.2%, followed by ground bud plants, accounting for 23.2%; the flora of the genera of seed plants in the forest park was dominated by tropical elements(48.8%), temperate elements(43.3%). the flora of the species was dominated by temperate elements(66.2%), followed by tropical elements(31.8%), including 9 endemic genera and 158endemic species in China.