The methods to exclude laryngeal cancer are as follows: 1.Indirect laryngoscopy: it is a common clinical examination method; 2.Electron laryngoscopy: it is more effective in detecting laryngeal cancer, and it is recommended that men with smoking history should have this examination as early as possible; 3.Pathological biopsy: any disease can be clearly diagnosed by case biopsy, and whether there is a mass in the larynx can be examined by laryngoscopy, and tissue biopsy can be taken at the suspected tumor site, which can not only clarify whether it is a cancerous lesion, but also judge the benignity and malignancy, and provide guiding opinions for subsequent treatment.