Fuente: WIPO "industrial hemp" In order to overcome the technical defects, the invention provides a method for controlling the blooming time and the blooming amount of industrial hemp. The method comprises a greenhouse, a layer ofheat preservation quilt is additionally arranged outside a greenhouse film of the greenhouse, a roller shutter machine is installed on the heat preservation quilt to achieve convenient covering and taking-down of the heat preservation quilt, and the whole greenhouse is tightly covered, wherein the illumination time is controlled to be 12 hours every day, the time that no illumination exists in pure dark days reaches 12 hours, the medicinal hemp can bloom at the height of about 60 cm in two weeks, the whole greenhouse is covered with the heat preservation quilt for 3 hours when the noon temperature is the highest, and the temperature of 40 DEG C in the greenhouse can be reduced to 26 DEG C, so that the temperature required by hemp growth can be met, and the illumination time can be shortened for blooming in advance. According to the method, the planting cost is saved, the space is effectively utilized, mines, marsh and saline-alkali soil are developed, the cost is reduced, high efficiency and high yield are achieved, and the method is environment-friendly, economical, reusable and free of pollution.