In order to combine the semantic web technology with the spatial information catalog service for the web (CSW), a semantic-supported spatial information CSW implementation method is proposed. Ontology is constructed to realize the semantic description of spatial information; the existing spatial information CSW model is extended to support the semantic registration of spatial data and services; semantic agent is constructed to realize the semantic-supported spatial information metadata query. The implementation results of the service prototype system show that the method can effectively improve the discovery ability of spatial data and services, and simplify the query steps.