Steel structure building is made from welding H section steel as column and beam, some of them has crane beam, it's made from H steel beam too.Galvanized C ,Z section steel as wall purlin and roof purlin, Its wall and roof are made of metal steel sheet or sandwich panel. The door is electric shutter door or flat open door. Window is pvc or aluminum window. With the extensiveuse of steel structure,its advantages are increasingly significant compared with traditional building.