Abstract: The first geologic reason for degeneration of the eco-environment in the headwater area of the Yellow river is that the increase of the recent geologic function caused deser tification and grassl ands resource decreased and underside changed,dest roied the balance of water-air-heat in the area;the second is that the water environment changes by the degradation and atrophy of frozen earth cause multilayer and synthesis cause of formation degeneration of the eco-environment;the third is that the man and rats function accelerated degeneration of the eco-environment in the headwater area of the Yellow river.