This　paper　introduce　the　development　of　ice　storage　system　and　overview　the　Concept　of　the　district　cooling　technology.　By　studying　the　cooling　plant　of　Beijing　ZhongGuanChun　square,　the　paper　describes　the　performance　of　the　main　equipments　including　the　chillers　and　coil,　and　the　control　strategy.　The　pictures　in　the　paper　show　the　principle　of　external　ice　storage　system　as　well　as　the　characteristics　of　charge　and　discharge　of　the　coil.　According　to　the　data　from　the　operation　and　construction,　the　paper　points　out　some　advantages　of　external　ice　storage　system　in　future.