Based on the characters of spatial data, a spatial data mining prototype system with J2EE was designed, which integrated spatial data warehouse, spatial data mining, and spatial visualization techniques. The major functional modules of the prototype were described: spatial data management and interactive module, spatial data mining module, and visualization module. Finally, implementation of the prototype was demonstrated using the land use data of a certain city, and the typical user interfaces were illustrated. It is available to meet the need of reliability, expansibility and usability.