In order to prevent recurrence and metastasis after surgery and improve the recovery effect, patients must abide by the following four rules – 1. The harm of smoking needs no explanation, while drinking alcohol is also an important factor of laryngeal cancer, and its carcinogenic effect may be even greater than that of smoking, especially the chance of laryngeal cancer increases significantly when smoking while drinking alcohol. Doctors can cure laryngeal cancer, but if patients do not change their bad habits and continue to drink and smoke, it is hard to avoid the recurrence of laryngeal cancer. 2.After radiotherapy or surgery, laryngeal cancer patients are very weak. Therefore, they should strengthen nutrition, eat high protein and vitamin-rich liquid diet, and eat slowly and moderately hot and cold so as to avoid lung cancer infection by food entering into trachea and bronchus. A mask should be worn in cold weather or when going out to avoid cold air entering the trachea to aggravate coughing and complications such as pneumonia. 3. For patients who keep wearing catheters, they should keep the catheter, catheter mouth and its surroundings clean, and usually cover the catheter mouth with gauze to avoid dust and bacteria from entering. Sputum should be sucked out when there is sputum, so as not to block the trachea and bronchi, and complications such as infection and pulmonary atelectasis occur. 4.Regular review is important. In general, after surgery and comprehensive treatment of malignant tumor of head and neck, it should be reviewed at least once every three months until 5 years, and once every four months after 5 years. If the laryngeal edema in radiotherapy disappears about 2 months after the end of radiotherapy, if it still does not disappear after 3 to 6 months, the possibility of cancer residual or recurrence should be thought of, and the patient should go to the hospital in time, and if necessary, relevant examinations should be conducted to clarify the diagnosis and timely treatment.