Interstitial pneumonia, also known as alveolitis. The clinical features are dry cough, shortness of breath, and specific rales in the lungs (fine twanging or Velcro rales). Chest x-ray is a hairy glassy shadow with nodular progression of the lesion; blood test SR is increased; pulmonary function measurement lung volume is reduced. Western antibiotic or hormone treatment is not effective. According to Mr. Li Kongding, a famous doctor in Sichuan, the basic pathogenesis of this disease is Yin deficiency and lung dryness, phlegm and stagnation, and inaccessibility of lung ligaments, except for the damp-heat type. The course of the disease is usually long. For the characteristics of the disease, he often uses Sha Shen, Mai Dong, Zhi Mu to nourish Yin and moisten the lung, Scutellaria Baicalensis, Lian Lian, to clear lung heat, Hai Fushi to resolve phlegm, Citrus aurantium to move Qi and open the lung ligaments, and Fu Ling, Huang Jing, Radix Codonopsis Pilosulae, Yam, Shen Qu to nourish the spleen qi and to replenish the earth to produce gold. The lung is a delicate organ, the main qi of the five viscera and six internal organs, and the main qi of the respiratory system. When the internal and external evil cause the disease, the evil can often be moved to the lung, based on the whole, correct the primary cause, focus on the lung but not limited to the lung, look at the whole picture and rule the disease.