Soil information system(SIS)has become a hot topic in soil science.It is imperative to establish Qinling-Bashan SIS due to the special geographical characteristics and the conflicts between limited soil resources and demanding agricultural production in Qinling-Bashan Mountain.This study collected a variety of soil data and related information,and established the soil database with the support from GIS.On this basis,SIS was developed with using C#.net plus ArcEngine,which achieved GIS basic functions of query and analysis,application modules including land evaluation and so on.The system will provide scientific basis for the prevention and control of soil erosion,sustainable development of agricultural production and related decision-making in Qinling-Bashan Mountainous area.