The regionalization of soil and water conservation in Jiangsu Province is to make up for the deficiencies of the third level of national regionalization in Jiangsu Province and thus to manage soil and water conservation in the province more efficiently. This paper builds the index system of regionalization in accordance with the characteristics of Jiangsu Province

simplifies the factors' indexes by principal component analysis method

and draws

with the aid of GIS software

the distribution maps of the four major factors

namely nature

economy and society

land use

and soil and water loss. In the maps

the analytic hierarchy process(AHP) is employed to get the weight of each factor

and the conditional raster image overlay method is used to complete the superposition of the four factors with GIS software. The resulted raster images are reclassified and thus the quantitative division of soil and water conservation in Jiangsu Province is finished. This method can improve the efficiency and accuracy of the regionalization of soil and water conservation in Jiangsu Province and make up for the deficiency of subjectivity in the current regionalization.