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Shiyang River Basin, located in the north piedmont of Qilian Mountain and the east of Hexi region in Gansu province, is one of the three major in land rivers in Hexi region, the fall of the elevation in the basin is large, the ecological environment is complex, the eco-system type is complete, the land cover type is various and the regional difference is distinct, is one of the sensitive areas for climate change. This research is based on Landsat MSS (1980), Landsat-8OLI(2015), filed study and vegetation chart and other multi-source data, using 3S technology to compile the data of land cover in Shiyang River Basin with high accuracy and analyze the changing features of land cover from 1980-2015 in the basin. We found the land utilization type distribution of Shiyang River Basin, forest mainly distributed in Qilian mountain areas where the altitude is relatively high, one part of the grassland which is the natural grassland is distributed in Qilian mountain area, the other part of the grassland, the artificial grassland is in the middle and lower area of the basin, which is cross distributed with the cropland. The vertical distribution of major cover type in the basin possesses distinct feature of zonation. Land cover goes from high altitude to low altitude, which is the distribution of the accumulation of snow, glacier, forest, grassland, built-up land, cropland, water body bare land or sand in sequence. These results provide a scientific basis for the study of land use and cover change in a critical region and will inform ecosystem protection, sustainability and management in area of Qilian Mountains.
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