This　paper　presents　a　framework　of　Geo-Information　Catalog　Service　System.　Catalog　Service　System　uses　for　the　administration　of　the　metadata　in　georesources　exist　in　Internet　to　implement　the　share　of　georesources.　This　paper　designs　the　framework　of　Catalog　Service　System　based　on　the　research　about　metadata　and　Metadata　standard,　experience　of　Metadata　Systems,　and　application　requirement.　Further,　this　paper　design　the　strategies　of　metadata　based　on　XML　in　description,　transform,　query　and　store.　Finally,　this　paper　provides　an　implementation　of　the　Catalog　Service　System　named　CAT　System,　which　is　used　to　build　a　GIS　Decision-Making　System　with　WFS　and　WMS　together.　The　GIS　Decision-Making　System　gives　GIS　technolgy　supports　to　Beijing　E-Gov.