With　Web　services　technology　the　functions　of　WebGIS　can　be　presented　as　a　kind　of　geospatial　information　service,　and　helped　to　overcome　the　limitation　of　the　information-isolated　situation　in　geospatial　information　sharing　field.　Thus　Geospatial　Information　Web　service　composition,　which　conglomerates　outsourced　services　working　in　tandem　to　offer　value-added　service,　plays　the　key　role　in　fully　taking　advantage　of　geospatial　information　services.　This　paper　proposes　an　automatic　geospatial　information　web　service　composition　algorithm　that　employed　the　ontology　dictionary　WordNet　to　analyze　semantic　distances　among　the　interfaces.　Through　making　matching　between　input/output　parameters　and　the　semantic　meaning　of　pairs　of　service　interfaces,　a　geospatial　information　web　service　chain　can　be　created　from　a　number　of　candidate　services.　A　practice　of　the　algorithm　is　also　proposed　and　the　result　of　it　shows　the　feasibility　of　this　algorithm　and　the　great　promise　in　the　emerging　demand　for　geospatial　information　web　service　composition.　©　2008　SPIE.