The length of the gastric tube is usually 45-55 cm for adults and 20-25 cm for children, usually depending on the length from the hairline of the forehead to the sternocleidomastoid, or from the tip of the nose to the sternocleidomastoid via the earlobe. If irritating drugs need to be injected through the gastric tube, the tube can be inserted 10 cm deeper to prevent the drugs from causing gastrointestinal discomfort, leading to reflux and aspiration. gastric tube intubation is often used for pancreatitis, intestinal obstruction and other gastrointestinal diseases, as well as for those who cannot swallow due to nerve damage and other factors to maintain the body’s nutrition. In patients who undergo gastric tube intubation, family members should pay extra attention to the daily care of the patient and clean the patient’s oral environment daily, and pay attention to observe whether the gastric tube is properly fixed before and after turning to avoid dislodgement. In addition, fluid or semi-liquid diet is recommended for each nasal feeding. Gastric fluid should be extracted before nasal feeding, which can help to check whether the gastric tube is dislodged from the stomach and whether the gastric tube is unobstructed. Afterwards, warm water can be injected to lubricate the tube lumen. Warm water should also be injected after the completion of nasal feeding to flush the gastric tube to prevent the presence of food residue in the tube lumen, which may lead to infection after the tube lumen is blocked or spoiled.