The treatment methods of anastomotic stenosis are as follows: 1, when stenosis occurs in the parotid duct opening and bacterial infection exists, saline and antibiotic solution can be extracted by syringe and rinsed out the parotid duct opening alternately to reduce the exudation of mucus and keep the lumen open. In the middle part of the parotid duct which is severely narrowed, the parotid sheath can be opened under general anesthesia, and the narrowed part can be removed after separating the facial nerve and the deep tissues; 2. When adhesion occurs at the junction of gastric and intestinal ducts after digestive tract surgery, the drugs to promote the gastrointestinal peristalsis can be applied to increase the discharge of gastric or intestinal fluids. Balloon dilatation can also be performed on the narrowed part, or a stent can be placed to open the lumen, and resection can also be performed if necessary.