#$%^&*AU2012100018A420120216.pdf#####ABSTRACT An open-air greenhouse, which has a geothermal system and multiple pipe brackets which extend a certain height, the said pipe brackets are spaced from each other at a certain distance, extend upwards from ground and bent towards to inner side of the greenhouse, the pipe bracket is internally provided with a hot air passage, a hot air outlet is mounted on lateral surface of the pipe bracket. With this open-air greenhouse, not only be benefit to plant off-seasonal vegetables and fruits, but also can irradiate sunlight directly on plants in chilly winter of north area. 5- r LI I U ~ Ulri u uu t-L 11 '-Irl - luL L Ul f-i f- i mii ri
