1. The span of the columnless steel frame greenhouse is 8- 12m, and the middle height is 2.5-2.7m The upper chord is made of steel bars or steel pipes with a diameter of 16 mm, and the lower chord is made of steel bars with a diameter of 12- 14 mm and the tension is/kl. There are five pull rods in the longitudinal direction, a film pressing line is arranged between every two steel arches, and both ends are fixed on the ground anchor. There are no columns in the shed, so the light transmission is good. Strong wind resistance and snow carrying capacity, convenient operation. It is assembled and easy to disassemble. 2. The structural span of the bamboo-wood frame greenhouse is10-13m, and the ridge height is 2.2-2.4m. The middle column is made of wood columns or precast cement columns. Set one root every 3 meters in the longitudinal direction, and 4-6 roots in each row in the transverse direction, with a spacing of 2-3 meters. Every 1 m, an arch is set, which is made of bamboo poles with a diameter of 3 cm or bamboo pieces with a width of 4-5 cm, and both ends are inserted into the ground. A wooden pole or thick bamboo pole for hanging beams. Each arch has a 30 cm high hanging column, which is supported between the arch and the cantilever beam. Press the membrane tightly with No.8 iron coin or film pressing line, and fix both ends on the ground anchor. 3. Improved shed structure The conventional shed can't cover grass. This one has a wide wooden beam that can stand in, and nails are nailed on both sides every 1.5 meters as hooks. One man stood on the board, and the other man stood under the shed. Pull the thatch off the top of the shed and hang it on the nail of this board, cover it on the east side of the shed, and then turn it back to the west, so that the whole shed is covered with thatch.