Abstract: The loading of spatial data servers can not be dynamically adjusted according to the characteristics of spatial data using current load-balancing methods in large-scale spatial data Web services.Aiming to grid data,we proposed a spatial-data-content-based dynamic loading balancing method,which can dynamically divide spatial data servers into several server groups according to geographical position relativity and accessing heat of spatial data.This method improves the cache utilization on every spatial data server.