Nasal pus with foul odor is one of the clinical manifestations of chronic purulent sinusitis, chronic purulent sinusitis (chronic purulent sinusitis) is a chronic purulent inflammation of the sinus mucosa. Nasal pus with odor related examination: 1, nasal cavity examination: lesions to the upper part of the nasal cavity changes are dominant, visible middle turbinate edema or hypertrophy, polypoid changes. Some have multiple polyps. The former group of sinusitis can be seen in the middle nasal passage and the surface of the inferior turbinate with mucopurulent secretion attached, and the latter group of sinusitis can be seen in the olfactory groove and the posterior part of the middle nasal passage with mucopurulent fluid. 2.Positional drainage: When chronic purulent sinusitis is suspected and no pus is present in the middle nasal passage or olfactory groove, positional drainage examination is feasible. 3, maxillary sinus puncture irrigation: maxillary sinus puncture washing is both a diagnostic method of maxillary sinusitis, but also a therapeutic measure. The effluent should be used for aerobic bacterial culture. 4, X-ray sinus film: the diagnosis is not clear or suspected of other lesions, can assist in the diagnosis. 5, dental examination: in the suspected odontogenic maxillary sinusitis, should be carried out about the dental examination. 6, ear, nose, pharyngeal swab bacterial culture: ear, nose, pharynx bacteria are from the outside world, under normal circumstances do not cause disease. However, under normal circumstances, they are not pathogenic. However, when the body’s systemic or local resistance decreases and other external factors, they can become infected and lead to diseases. Therefore, bacterial culture of ear, nose and pharynx swabs can isolate pathogenic bacteria, which is helpful for the diagnosis of otitis media, rhinitis, sinusitis, diphtheria, suppurative tonsillitis, acute pharyngolaryngitis and so on. The specimen is taken by the doctor using a sterile cotton swab and the secretions from the patient’s lesion area are sent for examination.