We conducted field studies on the breeding behavior of Sclater’s Monal(Lophophorus sclateri) on Mt Gaoligong in spring (March-May) at the year of 2002 to 2004.The single nest site found locates on a ledge (3.8 m) on the side of a large boulder (6.3 m).Egg-laying began in late March,incubation in early April,and chicks hatched in early May.Clutch size varied between 2 and 3 eggs (n=2) and the laying interval between eggs was 2 days (n=1).The eggs are cream-coloured,have fine reddish brown spots and average 85.8 g (n=5).The incubation period is 28 days (n=2) and chicks average 57.3 g (n=3) at hatch.All of the eggs were fertile and hatched successfully.The single nest site that we found was used for at least two years,possibly three,suggesting that nest sites might be a limiting factor for this population.