"New Materia Medica" records: "Bird's nest cures cough and asthma caused by lung fire, expectoration, qi deficiency, blood loss and strain." "Wen Tang Ji Fang Jian" treats phlegm and asthma: "Autumn, Pak Lei alone, after removing his heart, put one yuan into the bird's nest, boil water first, and then steam it with one yuan of rock sugar. Take it continuously every morning. " Folk bird's nest is stewed with 6 grams of bletilla striata and 6 grams of rock sugar, which is most suitable for pulmonary tuberculosis hemoptysis.