Objective　To investigate the spatial distribution and species composition of indoor and outdoor mosquito communities at the camp in Chayu county of Tibet, China. Methods　CO2 light traps and human-baited mosquito nets were used to sample the mosquitoes at the outdoor courtyard, around the animal pens, and in the forest. Captured mosquitoes were classified and counted, and the obtained data were statistically analyzed in terms of the number and species composition of mosquitoes. Results　A total of 822 mosquitoes were captured, belonging to 2 subfamilies, 4 genera, and 6 species, in this study. Among them, Culex pseudovishnui was the main mosquito community, accounting for 86.25% (709/822), followed by Anopheles maculatus, accounting for 5.47% (45/822), and Armigeres subalbatus, accounting for 5.23% (43/822). In the rooms, Cx. pseudovishnui was captured most frequently (0.476, 10/21); around the pen, An. peditaeniatus, An. maculatus, and Ar. subalbatus had relatively high capture frequencies, with ratios of 0.750 (6/8), 0.818 (9/11), and 0.615(8/13), respectively; Aedes vexans was captured only in the forest. Conclusion　The dominant mosquito species is Cx. pseudovishnui, which is endophilic, suggesting that indoor residual spraying and outdoor habitat management should be taken to control the mosquito species. An. peditaeniatus and An. maculates have a preference for animal sites, where the control should be focused on the two mosquito species.