The treatment of constipation caused by intestinal allergy must be based on the specific conditions of the patient under the guidance of the doctor to take different treatment programs, the main treatment methods are to change the dietary habits, oral medications such as lactulose, bacillus subtilis and so on, auxiliary defecation, such as glycerin enema and so on. 1. Dietary habits: patients with intestinal allergy should firstly stay away from allergens, and pay attention to record the food that can easily lead to intestinal allergy in daily life, and avoid them, meanwhile eat food rich in dietary fiber, such as vegetables and fruits. Drink more water, eat less spicy and stimulating food, and at the same time increase exercise to promote intestinal peristalsis. 2. Medication (1) Laxative drugs: Currently, the commonly used clinical drugs include polyethylene glycol electrolyte powder and lactulose oral solution. (2) Probiotics: commonly used drugs include Lactobacillus and Bacillus subtilis, which are prohibited for those who are allergic to this drug. (3) Enema drugs: commonly used glycerin enema, the use of intra-anal application, allergic to the drug is prohibited.