Abstract: The ecosystem stability of foraging habitat of Humes Pheasant(Syrmaticus humiae) in Dazhong Mountain Nature Reserve, Yunnan Province was synthetically analyzed, based on evaluating the data reflecting ecosystem stability and habitat suitability. The results showed that the ecosystem of Dazhong Mountain Nature Reserve could be divided into five different types of stability zones, including the most stable, stable, relatively stable, instable and the most instable areas. The potential and actual habitats of Humes Pheasant mainly distributed in the most stable, stable and relatively stable areas on the eastern slop,whereas less distributed in the instable and the most instable areas. This distribution pattern reduced the ecological risks from the suitability degradation caused by environmental fluctuation. There was a significant difference in proportion between the potential and actual habitat areas in the instable area of the ecosystem, and the actual habitat areas was significantly reduced with decline of the ecosystem stability. Human disturbance degraded the ecosystem stability in some parts of the reserve, as well as influenced upon the utilization of potential habitat and reduced the actual habitat area for Humes Pheasant. The ecological factors involved in evaluating the ecosystem stability only reflected the attribute of stability rather than habitat requirement by Humes Pheasant. The preference choosing habitat ecosystem with higher stability by Humes Pheasant was the result from adapting the environment passively. The plant diversity was high in the foraging habitat of Humes Pheasant so that it could provide the bird with abundant food for its survival. The relationship between animal and environment with the addition of higher species diversity was conductive to the formation and maintenance of the ecosystem stability.