Vegetation is one of the most important and most sensitive impacting factors of soil erosion. Vegetation information products that have high resolution in both time and space are needed to study dynamic changes of vegetation, for better understanding and monitoring of soil and water loss. A method is proposed to get high spatial and temporal resolution NDVI products, by matching the histogram of ETM NDVI( 30 m) to that of SPOT/ VEGET ATION NDVI product ( 1 km, one scene every month) . The estimated NDVI products( 30 m, one scene per month) are analyzed based on several indicators such as statistical characteristics of image, histogram similarity, and image fidelity. Results from the research can be applied to dynamic evaluation and monitoring o f regional soil and water loss.