Geographic　Markup　Language　(GML)　is　an　XML　encoding　for　the　encoding,　transportation　and　storage　of　geographic　informa　tion,　and　compact　Geographic　Markup　Language　(cGML)　is　a　compact　GML.　As　the　particularity　of　mobile　network,　cGML　becomes　the　encoding　specification　for　mobile　location　data.　But,　as　cGML　still　includes　large　quantity　of　coordinates,　the　efficiency　of　cGML　transmission　is　low　to　the　narrowband　of　wireless　network　and　low　performance　of　mobile　terminal,　which　constrains　the　development　of　Location　Based　Service　(LBS).　Therefore,　a　strategy　of　compression　and　transmission　on　cGML　spatial　data　has　been　proposed　in　this　paper,　and　its　application　in　LBS　is　described.　©2009　IEEE.