The　two-stage　water　evaporative　cooling　system　(TSEC)　has　the　advantages　of　lower　energy　consumption,　lower　costs-higher　environmental　friendly　and　higher　cooling　efficiency　than　the　direct　water　evaporative　cooling　system　(DEC)　and　the　indirect　water　evaporative　cooling　system　(IEC).　The　water　evaporative　cooling　technology　is　used　more　and　more　in　the　project.　The　cooling　performance　of　TSEC　is　validated　through　the　experiment　in　this　paper.　The　effects　of　performance　on　TSEC　are　analyzed　including　the　IEC　plate　interval,　velocity　of　the　primary　air,　relative　humidity　of　the　primary　and　the　secondary　air,　ratio　of　the　secondary　and　primary　air　flow　velocity　and　the　packing　thickness　of　DEC.　The　results　indicate　that　the　cooling　efficiency　will　be　higher　when　the　IEC　plate　interval　δis　4mm,　the　velocity　of　primary　air　ν1　is　2.0　m/s,　the　ratio　of　secondary　and　primary　air　flow　velocity　ν2　/ν1is　1.2,　and　the　packing　thickness　of　DEC　is　200mm.　The　experimental　and　the　theoretical　analysis　results　show　that　the　two-stage　evaporative　cooler　not　only　has　favorable　application　prospect　in　the　dry　region　of　the　Northwest　of　China,　but　also　has　abroad　application　in　the　medium　humidity　areas　such　as　Shanxi,　Gansu,　and　even　Beijing　.But　it　is　not　applicable　in　the　south　of　China　with　large　humidity　in　summer.