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Sustainable Water Resources Carrying Capacity is widely discussed now. The area of Shule River Basin is in the north-east of China, for avoiding excessive development, its sustainable water resources carrying capacity should be studied. This paper presents a GIS-Based WRCC assessment System. This system is composed of index system of WRCC assessment, data collection module, data preprocessing module, data integration module etc. Hydrological data, meteorological phenomena, water level, social economy, subsoil water, land use zone, water environment etc. can all be input and processed in this system. Based on the classification and regionalization of the ecosystem, multiple ecological management objectives and the spatial variability of the environmental flow requirements of the Shule River Basin can be analyzed in this system. An Index system of water resources carrying capacity assessment was constructed in this system, with the help of the dynamic data collection system, this system can provide a real-time assessment result supporting managerpsilas management decision.