Abstract: The forecast system of mineral resource potential of nationwide sylvite is implemented,it can forecast the national sylvite comprehensively. The collected sylvite information is handled systematically.The spatial data model is built in Oracle spatial database based on object-oriented.The framework of system is designed based on Service-Oriented Architecture, the manipulation of property data and spatial data is published as Web Services, and then clients can call services through network to realize management and analysis of the property data and spatial data integratively. The system is developed by object-oriented programming C# and ArcObjects. This system can integrate with other geoscience system through Web services and it contributes important reference value on integration and share of geoscience data and one-stop service based on Web services.