Practice has proved that in the winter and spring seasons with short illumination time and low intensity, more sunlight is collected in greenhouses, which plays an important role in improving the yield and quality of vegetables. The measures are: 1. Reasonable layout. When planting different types of vegetables in greenhouses, the principle of “lower height from the north to the south†should be followed, so that the plants can be staggered and arranged in an orderly manner, and mutual obstruction can be minimized. Transplanting the same kind of vegetables, trying to make the seedlings the same size, so that the plants grow neatly and reduce shading between the plants. At the same time, it is better to do planting in the north and south to make it as sunny as possible. Second, keep the shed membrane clean. Water droplets, dust and other debris on the film will reduce the light transmittance by about 30%. After the new film is used for 2 days, 10 days and 15 days, the lighting in the shed will be reduced by 14%, 25%, and 28% in turn. Therefore, it is necessary to regularly clean, wash the dust, dirt and water droplets on the surface of the house, and keep the surface of the film clean to increase the transparency of the film. Snow should also be cleared of snow in a timely manner. Third, the choice of non-drip film. The drip-free film incorporates several kinds of active agents in the formulation, so that the affinity between the water molecules and the film is greatly reduced, and the water droplets flow along the film surface into the ground without water droplets. The use of a drip-free membrane shed can increase the light intensity in the shed and increase the temperature of the shed. Fourth, reasonably uncover the straw curtain. Under the premise of doing a good job of heat preservation, appropriate removal of the straw curtain used for heat preservation and delayed cover curtains can extend the lighting time and increase the amount of lighting. Generally, the curtain is uncovered 0.5-1 hours after the sun comes out, and the curtain is covered half an hour before the sun goes down. Especially in the rainy days when it rains, it is necessary to properly uncover the sun's scattered light. Fifth, set the light curtain. With a 2-meter-wide, 3 meter-long aluminized film reflector, hanging on the north side of the greenhouse to make it perpendicular to the ground, it can add 40% light to the ground and increase the temperature of the shed by 3-4°C. In addition, laying silver-gray film on the ground can also increase the light intensity between plants. Six, do a good job of plant finishing. Timely management of pruning, snoring, tying up vines, and playing the old leaves in the field will be conducive to ventilation and light transmission in the shed.