Abstract: Based on the 2010—2015 MODIS NDVI time series data sets of Wei River basin, the change trend of NDVI in Wei River basin from 2010 to 2015 as well as the spatial and temporal pattern of vegetation coverage in 2010 and 2015 by GRC trend analysis method and vegetation coverage estimation were analyzed. Results showed that the value of NDVI increased slowly in the Wei River basin during 2010—2015 with a growth rate of 2.7%. The vegetation coverage increased gradually from northwest to southeast, and the high coverage areas were still concentrated in Wei River valley and the south of Yan'an. From 2010 to 2015, the area of high-middle coverage and the high coverage increased by 3.2% and 9.3%, respectively; The area of middle and low-middle coverage was reduced by 6.7% and 5.9%, respectively. The minor improvement areas were mainly distributed in the Tianshui area, and the minor degradation areas were mainly distributed in the northern of Qinling Mountains and the southern of Yan'an, and the obvious degradation areas were distributed in the southern foot of Liupan Mountain and Guanzhong region.

Key words: Wei River basin, NDVI, vegetation coverage, variation trend