I. Unit size of greenhouse: Parameters mainly include span, sash, eave height, ridge height horizontal distance between two adjacent main axes in the greenhouse in the direction of vertical gutter. Normally, 1. The greenhouse span size of 6.00 m, 6.40 m, 8.00 m, 9.00 m, 9.60 m, 10.80 m, 12.80 m. 2. Open space: the horizontal distance between two adjacent main axes in the greenhouse along the direction of the gutter. Usually, the greenhouse room specification size is: 3.00m,4.00m,4.50m,5.00m. 3. Eave height: the vertical distance from the indoor floor elevation to the eave under the gutter. Usually, the greenhouse eaves high specification size is 3.00m,3.50m,4.00m,4.50m. 4. Ridge height: refers to the distance between the floor height in the greenhouse and the highest point of the greenhouse roof frame. Usually the sum of eave height and roof height. Two, the overall size of the greenhouse and the scale of the greenhouse: the overall size of the greenhouse mainly includes the length, wi