Abstract: Investigations on vegetation in Baiyu Lalongcuo National Wetland Park, Sichuan province, demonstrated that there are 377 species of higher plants, belonging to 174 genera and 66 families, dominated by angiosperm, about 91.78% of the total species. There are 46 species of wetland plants, belonging to 27 genera and 21 families, dominated by Cyperaceae and Juncus. One species has been listed as the national first grade wild life of China for protection, 2 species as the second grade one, 5 species as rare and endangered and 5 species as endemic in China. In light of the areal-types of genera, the North Temperate component is dominant in the flora of the park. The natural vegetation in the park could be classified into 19 formations of 7 vegetation types and 5 vegetation type groups. Cultivated vegetation is not found. The results showed that formation of shrubs, meadows and swamps occupied 17 formations (89.47%). Formation of Spirogyra spp. could be few found in wetlands of China.