Abstract: Abstract：The evaluation index system of geo-environment regionalization,which has been established to evaluate the quality of geological environment, is of significance for effective protection and management of geo-environment. This paper is based on a comprehensive analysis of geo-environment information and achievements obtained in Jiangsu. Guided by the geo-environment problem and taking into account the harmony between people and earth,the principle of geo-environment security, geological resources protection and social needs as well as nature and science,the authors established the evaluation index system for six specialized regionalization divisions,i.e., geological disasters (prevention), mine geological environment (protection), mountain resource conservation, geological heritage protection, groundwater and soil pollution prevention. Besides,a comprehensive regionalization of geo-environment evaluation index system comprising seven target levels,sixteen constrained levels and forty indexes was established to provide a scientific basis for geological environment in Jiangsu.