Because the lack of studies on impacts of spatial distribution characteristics of certain patch on ecology process were lack,therefore,this paper sampled and studied the variety of spatial distribution pattern of the mobile dune patches with the grads in the typical regions of Horqin Sandy land with the application of 3S technique.

The fractal dimensions of pasture patches is higher than cropland patches,this indicatc grazing proccss has morn dramatically impact than agricultural action.

The diet selection is influenced by water resource, characteristics of the studied region and soil, and the plant species and the quality of patches, and the characteristics of the animal physiology and the animal communities.