When suffering from nasal pus with foul smell, the following examinations are needed: Nasal endoscopy: Nasal endoscopy is a rigid endoscope with a well-lit cold light source, which can penetrate deep into the nasal cavity to clearly observe the anatomical structure from front to back through mirror magnification, and nasal surgery is transformed from a blind empirical operation to one that focuses on the protection of normal structure and physiological function. The endoscopes commonly used in clinical practice are 0°, 30° and 70°, with a diameter of 4.0mm and a body length of 180mm, which have a large field of view and good brightness. Children can use 2.7mm diameter endoscope. Cold light source and light source wire should also be available. In order to do some simple operations, the following instruments should also be prepared 0 ° and 45 ° sieve sinus forceps, straight suction tube, curved suction tube, maxillary sinus trocar puncture needle, maxillary sinus biopsy forceps, butterfly sinus bite forceps, etc. If there is a video recording system to help operation, teaching and data preservation, all nasal hairs should be clipped before examination. CT examination of otorhinolaryngology: CT examination of otorhinolaryngology is a method of examining the otorhinolaryngology by CT. Nasal cavity examination: The entire nasal cavity parts cannot be examined with the naked eye of the examiner. Nasal examination includes nasal vestibular examination, anterior rhinoscopy and indirect nasopharyngoscopy. Requirements during the examination: During the examination, the subject’s head can be turned from side to side according to the need for observation so that the inner and outer walls of the nasal cavity can be observed in detail. Before retiring the mirror, do not put the two lobes of the anterior nasal mirror together to avoid pinching the nasal hairs and causing pain. Sinus examination: Sinuses are also known as paranasal sinuses and paranasal sinuses. Multiple air-containing bony cavities surround the nasal cavity. They are hidden next to the nasal cavity, the maxillary sinus is located in the maxilla on either side of the nasal cavity and above the orbit; the frontal sinus is in the frontal bone; the septal sinus is located on either side of the upper nasal cavity and consists of many small air-containing cavities in the septal canal; and the pterygoid sinus is in the chatter bone at the back of the nasal cavity. They all communicate with the nasal cavity with small openings. In addition to being involved in moistening and warming the inhaled air, the sinuses play an important role in shaping the human face, supporting the interior of the skull, and reducing the weight of the skull. There are various methods of sinus examination commonly used. Oral endoscopy: The advent of the oral endoscope has brought a new paradigm in the examination and treatment of the oral aspect of the mouth, when the patient’s view of the lesion is displayed in front of the patient without further description or expertise. Patients can also understand the urgency of treatment. The physician can further detect the patient’s oral lesions with the aid of clear visual images and various treatment measures taken in a timely manner.