The　two-stage　water　evaporative　cooling　system　(TSEC)　has　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　experimental　and　theoretical　analysis　in　this　paper　results　show　that　the　TSEC　system　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.　But　it　is　not　applicable　in　the　south　with　large　humidity　in　summer.