Nasal irrigation is a common method for treating nasal and sinus diseases. With the popularization of nasal endoscopy, nasal endoscopic surgery has become a routine surgery in otolaryngology, and after nasal endoscopic surgery, how to promote the early recovery of the mucosa of the operative cavity to prevent adhesion of the operative cavity and closure of the sinus orifice is an urgent clinical problem to be solved, and nasal rinsing is an important measure to alleviate the above postoperative complications. The exact role and mechanism of nasal rinsing, the current understanding may be related to the following mechanisms: improve mucosal cilia function. Reduce mucosal edema. Reduction of inflammatory factors. Physical or mechanical removal. Usually, 0.9% isotonic saline rinses are available.