Treatment of duodenal obstruction can be conservative. Conservative treatment means that if the duodenum is obstructed, a gastric tube will be placed first to suck out the obstructed material from the stomach and find the cause of the stricture. If the obstruction is caused by inflammatory edema or surgical edema, it can be treated by internal medicine, and the obstruction will be cleared after the edema is reduced, and the gastric tube can be removed. In case of stenosis after ulcer, although the stenosis is still present after the edema is removed, the patient can still eat without invasive treatment, and the obstruction can be removed after placing a gastric tube for a period of time, and the patient can be cured. If the effect of placing gastric tube is not good for long-term obstruction, it is necessary to find the cause. If the obstruction is caused by external pressure of tumor and inoperable, duodenal stent can be placed so that the patient can eat and drink until the end of life. If the tumor can be removed, surgical resection is required. If the obstruction is caused by scar stenosis and endoscopic dilatation treatment with stent placement is not effective, surgical removal of the obstruction is required.