Plastic greenhouses commonly known as cold shed, culture facilities protection is a kind of simple and practical, because of its easy construction, easy to use, less investment, along with the development of the plastics industry, has been widely used around the world. Use of the material such as wood, steel, and covering plastic film, a arched shed, for the cultivation of vegetables, can supply early or late, improve the yield per unit area, at preventing natural disasters, especially in the north in early spring and late autumn off-season supplies fresh vegetables.