Abstract: In order to reconstruct the MODIS- NDVI data, effectively extend the MODIS- NDVI data and provide the most effective basic data for the study of the relationship between vegetation and climate, the author used MODIS-NDVI and AVHRR-NDVI material in May to September from 2005 to 2009, through the pretreatment of NDVI succession, adopted the district appraisal to study the fitting relations between MODISNDVI and AVHRR-NDVI. According to the AVHRR-NDVI material, the author restructured the long time series of MODIS-NDVI from 1999 to 2009. The results indicated: MODIS-NDVI and AVHRR-NDVI had an extremely remarkable linear relationship, the correlation coefficient was 0.830-0.917 (n=52), the order of the correlation coefficient from high to low was central Liaoning, northern Liaoning, southern Liaoning, eastern Liaoning; long time series of vegetation index had response characteristics clearly to climate change and meteorological disasters, 2001 was another drought year after 1999 and 2000, the drought caused not in time water supply in the paddy field, so compared with that of other years, NDVI from 1999 to 2001 was generally lower, especially in 2001.