Abstract: From 1992 to 1994, stationary obesrvations were taken on the breeding ecology of Anser indicus in Bayinbuluke Swan Lake of Tianshan Mountains. The results show that its nest density is 0.59 nest ·m^-2 or 33～55 nests on each island, and the nests are unevenly distributed. For 184 nests observed, the average number of clutches in each nest is 4.47±2.19 eggs. The climax of egg laying period comes in early or middle May, and that of incubation period is reached in middle June.The goslings can fly 55～65 days after hatching in early August.The reproductive period is 10～20 days later than that in Qinghai region.

Key words: Anser indicus, Aggregated nests, Breeding ecology, Tianshan Mountains, sub-alpine meadow, δ¹³C, plant leaf, environmental factor