Nasal endoscopy is the use of rigid nasal endoscopy to do the nasal cavity, the nasal passages, as well as the sinus orifices related to the examination, clinically used to check the patient’s nasal mucosa, the nasal passages and sinus orifices, used to determine whether the patient has a rhinitis, sinusitis, nasal polyps, nasal tumors, nasal septum deviation, nosebleeds, and so on, related to the diagnosis of the disease. Clinical nasal endoscopy is revolutionary in that it can present the complete anatomical structure of the sinuses to the doctor’s eyes. Clinically, there are different angles of 0 degree, 30 degree, 70 degree, 90 degree and so on. Before doing the examination, the patient usually takes the lying position, the doctor uses cotton to anesthetize the contraction of the nasal mucosa, and then the doctor uses the rigid nasal endoscope to enter from the anterior nostril to examine the total nasal passage, middle nasal passage, inferior nasal passage, upper nasal passage, olfactory fissure, and the posterior nostril and other related structures, and judge whether the patient has any disease of the nasal cavity and the sinus. Clinically, nasal endoscopy has a clear visual effect on sinusitis, nasal polyps and other tumors in the nasal cavity.