Aimed at the characteriatics of assessment and management system of water resources in Shaanxi to be broad, complex and changeable,this paper took the platform of comprehensive integrated service as suport to set up the most stringent assessment of water resources management system structures of triple-nested model of province-city-county in Shangxi. The system made the calculation model componentization and used the system network knowledge graph to relize the itemized assessment and management of “six indicators” issued by Shaanxi province so that the stringent assessment of water resources management will be intelligent and visual.Result shows that the most stringent assessment and management system of water resources supported by integrated platform is operable and practical,and facilitate assessment and management of water resources.The platform can provide technique support for the most stringent assessment and management system of water resources.