The important water-supply ecological function area of Yellow River in South Gansu is located along the northeast edge of Qinghai-Tibet Plateau.It has the total area of 3057000hm² and is a sensitive change zone of ecological environment in arid territory.The Maqu wetland,once honored as "the reservoir of the Yellow River",tends to be dry up and its ecological environment becomes very fragile.Based on the present ecological situation and the distribution of natural pasture,an appraisal system of ecological frangibility in the area is established by using the related ecological fragility appraisal method and analyzing the meadow ecological environment.The ecological function area can be classified as a medium or serious fragile region.Finally,the causes of ecological fragility are analyzed.It is expected that the study may provide a reference to ecological environment protection.