In fact, there are quite a lot of duel cancers, and there are more and more patients with duel cancers as people live longer. Duplex cancer seriously affects the patient’s prognosis and greatly reduces the survival rate, for example, if a cancer patient gets duplex cancer as lung cancer, its 5-year survival rate drops to 20%, and the impact of duplex cancer on survival rate is greater than that of primary tumor. Research reports suggest that the incidence of laryngeal cancer dichotomous cancer is 4-30%, with an annual incidence of 2.1%-2.7%, and the risk of laryngeal cancer patients getting another cancer is 1.68 times higher than that of normal people. The main factors for the occurrence of duplex cancer are heavy smoking and alcohol consumption, so patients with heavy smoking and alcohol consumption before surgery need to be followed up closely. I have a patient with laryngeal cancer in Anhui province, who was treated surgically in 2012 and developed another cancer, i.e. lung cancer, in less than 2 years, but the larynx has been normal. Another patient with laryngeal cancer in Zhoushan, who had surgery more than 8 years ago, rarely followed up after the surgery, kept drinking high alcohol after the surgery and got another cancer, because he didn’t follow up for the last 5 years, but the second cancer was so big that he came to follow up and finally couldn’t be operated, which is really sad. We suggest that all patients should quit smoking and limit alcohol after surgery, and have regular follow-ups (including at local hospitals).