Patients with dry rales have narrowed or incomplete obstruction of the respiratory tract on the basis of inflammation-induced mucosal congestion and edema and increased secretion, bronchial smooth muscle spasm; lumen obstruction by tumors or foreign bodies, as well as lumen stenosis caused by compression of the lumen by enlarged lymph nodes outside the ducts or by tumors of the mediastinum, and so on. Dry rales patients avoid smoking, avoid eating cold food, avoid eating greasy not easy to digest food. Dietary contraindications 1, avoid smoking; 2, avoid eating cold food; 3, avoid eating greasy not easy to digest food. Watermelon: a cold food, which can inhibit the immune function of the lungs, thus causing the exacerbation of lung infection. It is advisable to eat pumpkin light warm food. Coffee: contains caffeine, which has a strong excitatory stimulating effect on the central nervous system. Soy milk as well as fruit juices are recommended. Sesame Pepper: It is rich in unsaturated fatty acids, which can weaken the immune function of the body. Especially increase the cardiovascular burden, thus affecting the recovery of respiratory function. It is advisable to eat lean meat.