The　energy　consumption　of　window　accounts　for　nearly　half　of　buildings.　The　purpose　of　this　study　is　to　compare　the　environmental　impact　of　plastic　windows　and　aluminum　alloy　windows　production,　including　resource　and　energy　consumption,　waste　emission.　The　result　shows　that　energy　consumption　of　plastic　window　production　is　only　0.24　times　of　aluminum　alloy　window　production,　and　the　overall　environmental　impact　of　the　former　is　30%　of　the　later.　This　study　is　a　quantitative　description　of　energy　consumption　and　environmental　impact　of　two　windows　production　pattern,　which　intends　to　fill　the　blank　in　LCA　field　of　windows　in　China.　©　(2014)　Trans　Tech　Publications,　Switzerland.