According to the manual, it is recommended to replace the nasal feeding tube once a week, but according to many clinical experience, it is recommended to replace the tube once in 3-4 weeks, mainly for the following reasons: First, the nasal feeding tube is mainly used for patients who are unconscious or cannot eat through the mouth in the pharynx. In the process of going down, the patient may have nasopharyngeal pain, nasal bleeding, foreign body sensation in the pharynx, mis-swallowing, choking, coughing and other related reflex processes, especially for comatose patients, it may be more painful, so frequent replacement of nasal feeding tubes is not recommended. Secondly, during the application of nasal feeding tube, patients may experience nasal discomfort, nasopharyngeal discomfort and pharyngeal discomfort. If the nasal feeding tube is changed for a long time, it may induce patients to experience increased discomfort and may easily induce nasal bleeding. Thirdly, most of the nasal feeding tubes are made of imported materials, which are better and less irritating to the nasopharynx and throat and less irritating to the stomach, so there is no need to change the nasal feeding tubes frequently for a long time in clinical practice.