Colds are the most common acute respiratory infections with a high incidence and are easily cross-infected with each other. Cross-infection can be prevented by the following. First, isolate patients with colds, avoid close contact with them as much as possible, and actively treat patients with colds. Second, do a good job of personal protection, such as wearing a mask, avoiding going in and out of crowded public places, avoiding contact with people with colds, and washing hands regularly. Thirdly, during the cold and flu season, or when there are cold and flu patients at home, and after the appearance of related symptoms, you can take oral anti-viral Chinese medicine, etc., to prevent in advance, appropriate activities, frequent ventilation in the house, to improve their immunity.