Abstract: Based on the summarization and extraction of regional agriculture information management and evaluation theory and technology achievements, a set of dynamic knowledge models which can be used for cropping system evaluation, ecological distribution of farm products, estimation of cropping potential production, precision farming management were developed through knowledge engineering and system modeling method. By using the technology of software component, with Browser/Server mode as distributing network structure, with WebGIS as spatial information management platform, a web-based digital system for agricultural spatial information management and aided decision-making was developed. The system realized the functions as basic map handling, agricultural spatial information query and analysis, cropping system evaluation, ecological distribution of farm products, estimation of cropping potential production, precision farming management, visual display of results, and system maintenance. Case studies on WGASIMS with the datasets in Jiangsu Province indicate the system can effectively manage regional agriculture spatial information, and show a good applicability and guidance on agriculture farming management.