The habitat preservation is important for the protection of migratory birds wintering in Lake Poyang, while the bird habitat area and spatial distribution change along with water Level processes.This paper analyzed the topography classification of wetland transitional zone of Lake Poyang and fluctuating area in the water and land(sparse marsh areas and shallow water) as wintering habitat for migratory birds.Then we selected remote-sensing image data under different water level and obtained dififerent water surface area of the transitional zone and its spatial distribution, and analyzed various water level conditions influence on the habitat of migratory birds.Through analysis of Lake Poyang National Nature Reserve, under the topography of water level processes, changes in migratory birds and their habitat of migratory birds wintering in the impact of the proposed wetland birds on the lake habitat (land and water trangition zone), the natural water level process was important measures for ensuring the migratory birds(especially waterfowl)living through the winter in Lake Poyang.