In　order　to　improve　the　feasibility　of　the　overall　design　scheme　of　coastal　urban　planning,　a　general　design　scheme　of　coastal　urban　planning　based　on　Geographic　Information　System　(GIS)　is　proposed.　This　paper　constructs　a　geographic　information　analysis　model,　which　combines　information　fusion　with　large　data　information　processing　methods,　and　carries　out　geographic　information　data　fusion　and　processing　analysis　of　coastal　urban　planning.　According　to　the　distribution　attributes　of　the　data,　the　collected　geographic　information　data　are　clustered.　Fuzzy　C-means　clustering　method　is　used　to　realize　coastal　urban　planning　geographic　information　data　fusion　clustering.　Based　on　the　adaptive　correlation　integral　matching　method,　the　geographic　information　data　clustering　centers　of　coastal　urban　planning　are　searched　to　realize　data　correlation　mining.　Principal　component　analysis　is　used　to　mine　the　key　information　of　coastal　urban　planning　and　clustering,　and　to　guide　the　optimal　design　of　coastal　urban　planning.　Finally,　the　software　is　designed　and　simulated.　The　results　show　that　the　method　is　effective　in　the　overall　design　of　coastal　urban　planning.　Through　GIS　geographic　information　fusion　and　dispatch,　the　feasibility　of　coastal　urban　planning　and　design　is　improved.