Abstract:Southern Tibet has a more complex topography, rich plant resources and high species diversity. For the survey of alpine plant diversity in the Shannan region of Tibet, field surveys, specimen collection, review of botanical histories and other relevant information and taxonomic identification were conducted. The results indicate that Arenaria globiflora (Fenzl) Edgew. & Hook. f. and Silene birgittae Bocquet are newly recorded species in China. This report, on the one hand, enriches the flora of China, updates the diversity of domestic Caryophyllaceae family, and has some significance for the conservation and study of plant diversity in the Shannan region of Tibet, China. On the other hand, it shows that plant diversity surveys in some areas of Shannan, Tibet, China are still inadequate and there are still many survey weak areas, which need to strengthen plant diversity surveys.