Since　reform　and　opening　up,　as　an　important　factor　of　economic　growth,　trade　has　promoted　the　development　of　China＇s　economy　sharply,　at　the　same　time,　it　brought　about　the　destruction　of　the　ecological　environment　which　is　the　focus　of　academic　debate.　There　is　still　not　any　definite　conclusion　about　the　impact　of　trade　on　the　environment.　In　this　paper,　by　establishing　a　measurement　model,　we　calculate　the　environmental　effects　of　trade　from　scale,　technology　and　structure　three　aspects,　conclusion　shows　that　the　structure　effect　and　technology　effect　of　liberalization　of　trade　will　improve　the　level　of　China＇s　environment,　but　the　scale　effect　of　trade　while　promoting　economic　expansion　will　cause　environmental　damage.