Based on the data from remote sensing satellite images, the paper deals with the characteristics of the evolution of ecological environment in Qinghai lake area. The research revealed that aridity was the main reason for the change in ecological environment in the area. Due to the annual evaporation in four times the annual precipitation, the lake level descended by 3.16 meters and the lake surface shrank by 279.4 km2 from 1956 to 1986; and the desert area was up to 450 km2 in 1986, which increased by 115 k...