Abstract: From October 2017 to July 2018, the resource survey of Moschus berezouskii was conducted in Sichuan Baishuihe National Nature Reserve, by the line transect method, infrared camera monitoring method and interviewing method, to figure out the resource of M. berezouskii and to provide a management basis. The results showed that there were about 1 523 individuals of M. berezouskii at the density of 5.05 km^-2, which was at the medium level and did not exceed the theoretical capacity of Baishuihe National Nature Reserve. In habitat selection, M. berezouskii preferred the ridge or upper slope of deciduous broad-leaved forest or coniferous and broad-leaved mixed forest with rich food, good concealment conditions, high canopy density, steep slope and weak interference. The daily activity indicated that M. berezouskii activities were mainly concentrated in the daytime, and the daytime activity frequency was twice than that of nocturnal activities. The living environment, population density and daily activity of M. berezouskii were studied in detail in Baishuihe National Nature Reserve, which would provide reference materials for the protection of M. berezouskii.