Malignant lesions of nasal cavity and sinus are more common, and according to domestic statistics, it ranks fifth among systemic malignant tumors, while nasopharyngeal cancer has topped the list of tumors in high-incidence areas. Nasal cancer is related to the following factors: 1. chronic inflammation stimulates most patients with chronic rhinitis and sinusitis for many years, so that the nasal mucosa is stimulated to become squamous epithelium for a long time, which becomes the basis of cancer. 2.Malignant transformation of benign masses such as sclerosing nasal disease, granuloma caused by fungal disease, nasal polyp and nasal inversion papilloma can become cancerous. 3, exposure to carcinogenic substances long-term exposure and inhalation of nickel, arsenic, chromium and compounds; long-term exposure to hard wood chips and soft wood dust; and exposure to chronic stimulation of wood protective agent chlorophenol paint. 4.Viral factors have been found that EBV is the main pathogenic factor of nasopharyngeal carcinoma.