The following are the contraindications to the clinical application of Bayberry: Firstly, no oily food and no spicy food should be eaten during the application of Bayberry. The second point is that the diet should be light when using mother of pearl, so that the medicinal effect will be brought into play. The third point is that pregnant women, children, the elderly and other special groups should be under the guidance of a doctor when applying mother of pearl to prevent more side effects on the body. Bayberry is a good effect herbal medicine, which has the effect of relieving cough and phlegm, clearing heat and dispersing nodules, and moistening the lung. It is clinically very effective for diseases of the respiratory tract. In daily life, the stew of mother-of-pearl and pear is often used to treat dry and itchy throat, cough, as well as respiratory symptoms such as phlegm and runny nose, which is a very good adjunct treatment.