In　order　to　make　best　use　of　wind　energy　resource　to　achieve　the　building　natural　ventilation,　this　paper　develops　a　new　type　of　natural　ventilation　device　-　automatic　wind　catcher　based　on　the　basic　wind　pressure　principle.　The　wind　catcher　can　catch　the　wind　direction　automatically　and　induct　the　outdoor　fresh　air　into　the　room　organically.　This　paper　will　study　the　outside　and　inside　flow　field　distribution　of　the　wind　catcher　through　the　numerical　simulation　method.　The　air　flow　rate　can　be　get　from　both　simulation　and　experiment　and　the　results　will　be　compared.　According　this　the　performance　of　the　wind　catcher　can　be　preliminary　evaluation　and　the　further　way　of　optimization　can　be　bring　forward.　It　also　supplies　the　preliminary　basis　of　engineering　application　and　the　design　of　the　building　natural　ventilation.