In this study NDVIC,assigned as the NDVI value in an effort to eliminate the influence of rainfall,based on time series of rainfall data and temporal SPOTVEG NDVI data,was used to evaluate the effects of "Grain for Green " project for the period 1998-2005 in Yulin,Yan'an,Xi'an and Ankang of Shaanxi Province.A strong relationship existed between rainfall and integrated NDVI(monthly) for all four sampling domains(R = 0.27 to 0.82),while the correlation coefficient increased from south to north.Vegetation coverage has increased in Yan'an from 1999 to 2005,especially in 2002-2005,showing some correlation with the climate variables,especially rainfall(1 month time-lagged),but precipitation alone don't fully explain the increased green cover.Increased NDVIC in October expresses an obvious effect of GFG on the vegetation change.It provided a thought for objective and repeatable evaluation of effects of "Grain for Green" program.