Abstract: Economicefficiency of vegetable production in plastic greenhouse can be improved bythree ways. Because of adopted the new structure of greenhouse th e heatingcost is saved. It can absorb solar energy in the maximum limit in the daytime and lose heat in the minimum limit in the nightime during winter in Beijing. The temperature in the greenhouse is 15.45℃ when outside is -13℃ . Secondly, the utilization ratio of the area in the greenhouse is increased up to 117.6% by adopting soilless culture and mutually beneficial growth of vegetables and mushrooms. Finally, because of mutually beneficial growth of vegetables and mushrooms in the greenhouse, the plants absorb carbon dioxide that is produced by mushrooms, increase the yields of vegetables and eliminate adverse effect on mushroom growth. The experi ment on cucumbers has showed thatthe yield can be increased by 25%.