In Lingnan region, there is a lot of heat and humidity, and heat hurts fluid and depletes qi. In addition, if we do not pay attention to our personal lifestyle, we stay up late and drink alcohol, watch cell phones and browse the Internet all night long, which depletes yin fluid. At first, the symptoms of deficiency of fluid, such as dry mouth, dry eyes and dry stools, can be seen, but if they develop further, they will show signs of yin deficiency. Patients with Yin deficiency generally have a thin and long body shape, often feel irritable and hot in the heart, have flushed cheeks, are intolerant of heat, feel dry in the throat, dry mouth and throat, dry skin, constipation, insomnia, have an impatient and outgoing temperament, and have a red tongue with little moss. Such patients should eat foods that nourish Yin, such as lean pork, duck, mung beans, winter melon and other cool and nourishing products, and eat less mutton, leeks, chili peppers, sunflower seeds and other warm and dry products, and give lotus seeds and lilies to boil lean meat, honey steamed lilies to clear heat and moisten dryness. At the same time, we should also pay attention to change their own work and rest time and lifestyle. Do not stay up late, avoid working in the heat; do not sweat too much when exercising, and replenish water in time. Chinese medicine can be examined to increase the liquid soup, saxifrage maitong soup and other nourishing yin liquid formula as the main formula.