Abstract: To deeply understand the current status and regional composition of plant resources in the Yanyi National Wetland Park in Xizang and to strengthen wetland planning and protection, a plant survey was conducted within the Yanyi Wetland area during May 28 to September 10, 2021, employing a sample plot survey and a sample line method. Using a combination of Two-Way Indicator Species Analysis (TWINSPAN) and One-Way Analysis of Variance (ANOVA), this study analyzed the plant species composition, floristic characteristics, community types, and plant diversity of the communities within the Yani Wetland. The study results indicate that the Yanyi National Wetland Park in Xizang has a total of 314 species of vascular plants, affiliated with 65 families and 197 genera. Among these, there are 10 species of ferns belonging to 7 families and 8 genera, 2 species of gymnosperms belonging to 1 family and 2 genera, and 302 species of angiosperms belonging to 57 families and 187 genera. In terms of species composition, herbaceous plants dominate with 143 species across a total of 38 families and 93 genera. Two species of nationally important wild plants (Class II) were recorded, belonging to 2 families and 2 genera: Fagopyrum dibotrys and Prunus mira. Additionally, 15 alien plant species were identified, spanning 10 families and 15 genera, including Inca Peacock Flower and European Hyssop. The temperate distribution types within the plant family and genus distribution patterns of the Yanyi Wetland account for 51.72% and 67.11% respectively, excluding the worldwide distribution type which indicates that the flora of the Yanyi National Wetland Park in Xizang exhibits distinctly temperate characteristics. The Yanyi Wetland area was divided into five plant community species using the TWINSPAN classification method. Among these, shrub-herb communities (communities I and II) exhibited higher diversity levels than herb communities and woody vine-herb communities (community V). In the Nyang River community, dominant shrubs include Rosa sericea f. glandulosa and Artemisia wellbyi, with grasses such as Pennisetum flaccidum being the dominant species. In the confluence area, dominant shrubs are Myricaria wardii and Rosa sweginzowii, and herbaceous plants like Polypogon fugax and Carex nudicarpa. The Yalu-Zangbo River community features herbaceous plants like Polypogon fugax and Cynoglossum furcatum as dominant species. There were significant differences among different communities. The diversity of the Rosa chinensis var. Glandulifera-Pennisetum flaccidum community was significantly higher than that of other communities (p<0.05). With the exception of the Margalef diversity index, the values of other diversity indicators for the Clematis pseudopogonandra-Polypogon fugax community were significantly lower than those of other communities (p<0.05).