Abstract: From May 2014 to April 2015, we investigated the diversity of birds in the Lhalu wetland, Lhasa， using line transect method. A total of 69 species were recorded, belonging to 26 families, 12 orders, accounting for 11.5% of( more than 600 specie) birds in Tibet of which one species(Grus nigricollis) of I national protection bird and one species of Ⅱ national protection bird were found. The geographic region system was dominated by Palearctic species with 39 species, accounting for 56.52%, including 17 species of Oriental birds and 13 species of widespread species. Resident was in the majority with 28(40.58%) species, followed 24(34.78%) species of migratory bird, 13 winter visitor and 11 summer visitor, and 17(24.64%) species of passage migrant or vagrant visitor. The similarity of birds in different seasons was the highest between spring and summer, and the lowest between winter and summer. In spring and autumn, the number of species was abundant, but the population was small,and in winter the number of species was low, but the population was large. Compared with each month, it could be seen that the population in January was the highest, the number of species in May was the highest, and the population and number of species in July were both the lowest. Bird diversity showed two small peaks in May and November, and the values of Simpson and Pielou were stable throughout the year.

Key words: Lhalu wetland, bird community, birds species, population, seasonal variation