Nasal irrigation with medical saline is a very good treatment method that is widely used clinically for the routine treatment of rhinitis, sinusitis and post-operative sinusitis. Because the osmotic pressure of saline is similar to that of the human nasal mucosa, nasal irrigation with saline will not lead to changes in the osmotic pressure of the mucosa, and it can rinse away viruses, bacteria and secretions from all angles and structures of the nasal cavity, so as to maintain a very good environment of the nasal cavity and avoid the appearance of rhinitis, sinusitis and other nasal infections. However, when patients do nasal rinsing, the requirements of the rinsing solution are very strict, not to use hypotonic or hypertonic water rinsing, which not only can not achieve the effect, but will lead to clinical manifestations such as dryness, erosion, ulceration, and even edema of the nasal mucosa.