Nasogastric tube is a method of inserting a catheter through the nose into the stomach and injecting fluid food, water and medication through the tube. The maximum amount to be fed at one time is determined by the patient’s physical condition, and generally should not exceed a maximum of 200 ml and should be given at intervals greater than 2 hours. The exact amount to be fed should be chosen under the supervision of the doctor. For patients who have just started to use nasal feeding tube, it is recommended to start with an injection volume of 60-80ml. Observe the patient’s digestion, i.e., check by suction before each use of nasal feeding, if there is no residual liquid, it means that the patient can be digested. For patients who can be digested, their nasal feeding volume can be gradually increased from 60 to 80 ml to 100 ml to 120 ml, but it should be noted that the volume of each nasal feeding should not be more than 200 ml and should be separated by an interval of more than 2 hours. Since most of the nasal feeding tubes go deep into the jejunum, they are also called jejunal nutrition tubes. Since the volume of the jejunum is small and the patients who need nasal feeding are usually gastrointestinal dysfunction, if too much nasal feeding is given at one time (≥200ml), it will lead to abdominal distension, and even nausea and vomiting as well as a decrease in blood pressure. In order to avoid the above phenomenon, the amount of nasal feeding should not exceed 200ml every 2 hours. Special attention should be paid to check whether the temperature is suitable before nasal feeding to prevent too hot food from hurting the gastric mucosa. You can take a drop of the beaten meal or liquid food and put it on the back of your hand for testing. In conclusion, the maximum amount of food to be fed by nasal feeding tube should be 200ml at one time, and the interval between feeding should be more than 2 hours, and the specific feeding dose should follow the doctor’s prescription to avoid self-medication.