Eat more cold foods before and after Grain Rain: Before and after Grain Rain, you should eat more nourishing cold foods, such as watermelon, melon, banana, sugarcane, mango, loquat, apple, pear, persimmon, water chestnut, mulberry, tomato, cucumber, bitter gourd, white radish, loofah, lotus root and water chestnut. The practice of Wuguyu Shun 'an Health Soup: Take half a pear, five water chestnuts and 30g lotus root from Zhaoxian County, Hebei Province, or chop it with 50g sugarcane, and put it with fresh reed rhizome 15g and Ophiopogon japonicus 15g into a milk pot filled with 1000ml water, which can be seasoned with rock sugar. Grain Rain 9- 100g delivered on the same day. This prescription was prescribed by Wu Jutong, a famous doctor in Qing Dynasty. Among them, fresh reed roots can clear away heat, relieve annoyance, promote fluid production and quench thirst; Sichuan Ophiopogon japonicus moistens the lungs and nourishes yin, benefits the stomach and produces fluid, and clears the heart and removes annoyance; Yali pear is sweet and slightly cold. It is a storehouse of fructose, which can clear away heat and promote fluid production, moisten dryness and eliminate phlegm, relieve cough, regulate blood pressure, lower cholesterol and promote sleep. Water chestnut is sweet and warm, harmonizing the liver, benefiting the five internal organs, improving eyesight and benefiting the stomach; Lotus root tastes sweet, flat and astringent. According to the records of materia medica, it can tonify the middle energizer, replenish qi, quench thirst and remove heat, strengthen the stomach and intestines, strengthen essence and make people strong. Sugarcane can help the spleen and stomach, benefit the large intestine, quench thirst, and relieve heart and chest heat.