Abstract: Based on remote sensing image data， field investigation and socioeconomic data， according to the local ecological environment situation，take Huangnan Tibetan Autonomous Prefecture (Huangnan) in Qinghai Province as a case for the study to establish ecosensitivity index system in the study area. Applying AHP method and GIS technology，the weight of each factor and ecosensitivity was analyzed and the result showed that Huangnan Prefecture was a moderate ecosensitivity area，the ecosensitivity in the northwest part was higher than the other parts. The area with high ecosensitivity accounted for only 124% of the total area in the prefecture. The area with moderate ecosensitivity and the area with low and no ecosensitivity in Huangnan Prefecture took 5735% and 4141% of the total area respectively.Huangnan Prefecture was divided into four ecological function areas according to the result of the ecological sensitivity assessment，which provide a theoretical basis for future ecological environment construction in Huangnan Prefecture.