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Poultry is a kind of warm-blooded animal. Due to its high body temperature and high metabolism, poultry breeders, especially laying hens, are particularly sensitive to temperature and light. They are slightly careless and may cause them to become frozen and cause diseases, resulting in decreased egg production and even death. In winter, the method of light insulation for layer-laying chickens is: Illumination method: natural light and artificial light can be used. Natural light refers to sunlight, and sunlight can enhance body metabolism and have bactericidal effect. Artificial lighting refers to the use of various lights, mainly electric lighting. At present, closed houses are generally used artificial light and achieve high production efficiency. If the natural lighting time is insufficient, artificial lighting can be used to supplement. Combined use, it can not only save lighting electricity, but also adjust the most suitable ambient temperature to meet the needs of layer chicken growth. Light intensity: The most suitable ambient temperature for laying hens is 16°C-21°C, the required low temperature is not lower than 4°C, and the high temperature does not exceed 30°C. In a certain range of hens, their egg production also increased with the increase of light intensity. The suitable light intensity for laying hens is generally 5.8 lux-10 lux, and the illuminance of 2 watt-3 watt bulbs per square metre of chicken house can be. Illumination principle: During the growth phase of laying hens, the light is preferably within 10 hours. If it cannot be done, it should be gradually shortened or kept in balance, and must not be incremented. Egg laying chickens in the laying period should have a long duration of light. The daily light time can be as long as 14 hours, and the longest is 18 hours. It is no longer beneficial to egg production, and must not be reduced or changed abruptly. Otherwise, egg production will decrease. The illumination of the sealed chicken house can be controlled according to the physiological state of the chicken, and the light is all artificial light. When it is found that a small amount of light leaks from the air inlet and exhaust holes, a light shield should be installed at the air inlet and outlet. During the first few days of the brooding, the duration of illumination is longer, so that the young chicks can learn to eat and drink as soon as possible. The 20-week-old chickens are given 8 hours to 9 hours, and the weekly increase is 45 minutes from the 21-week-old age, and the maximum is 16 hours at the 31-week-old age. After that, it will remain unchanged. In the last few weeks of egg production, the lighting time will be increased to 18 hours.