The study area is located in the north of Hebei Province with a total area of 76 275.6 km2.In recent years, artificial activity changed the land use type and the plant degradation arose the attention of people. This study assessed the trend and spatial-temporal distribution of vegetation index change, which is related with vegetation degradation, in North of Hebei Province using multi-temporal NOAA/AVHRR NDVI data (8 km spatial resolution) from 1987 to 2000 provided by NASA, meteorologic data, DEM data (1:250000) and relative economic data. Results show that the characteristic of NDVI change owing to land cover are concentrative and connective, while the characteristics of NDVI change owing to land use are sparse and scattered. The average change of NDVI is 0.35 for land cover change and the average change of NDVI is -0.17 for land use change and they have contrary change direction. The artificial factors such as the changes of land use or crop type have contribution to NDVI change, but the influence is limited. Precipitation, especially its distribution in growth season is the important influencing factor for NDVI change.
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