Intestinal lavage is clinically known as enema, it is not recommended that patients operate at home, it is easy to accidentally injure the intestinal mucosa due to irregular operation, and there may be inaccurate control of the time of enema, the degree of cleanliness is not sure, resulting in a series of complications. It is recommended to the hospital to let the professional physician operation completed, the patient can cooperate: a. Operation: enema clinical generally use disposable enema, the operation needs to be filled with enema fluid, enema fluid can choose warm water, saline, etc., should not choose irritating liquid. After the doctor connects the catheter of the enema, hang the enema to a high place and check whether the catheter is smooth and there is no extravasation. Patients need to cooperate with the doctor to insert the catheter slowly into the anus, and the end of the catheter is fully lubricated with paraffin oil and corkel, etc. The process should avoid damaging the anus and intestinal mucosa. Afterwards, the enema patient can sit on the commode to operate, and the doctor will turn on the switch of the enema to make the liquid flow slowly into the patient’s intestine, and then close the switch after the solution is filled, remove the end, and discharge the liquid after a few minutes. If the intestinal contents are more, you can cooperate with the doctor to repeat the above operation again. Precautions: 1. Contraindications: Pregnant patients, acute abdomen, gastrointestinal bleeding and patients with serious cardiovascular disease should not be enucleated; in addition, patients suffering from hemorrhoids, radiation enteritis, ulcerative colitis and other diseases need to insert the catheter carefully to avoid causing bleeding; 2. Operation process: The speed of injecting enema solution should not be too fast to avoid stimulating the intestinal mucosa and causing defecation reflex; when removing the enema, it is necessary to prevent Air must be prevented from entering to avoid abdominal distension. If a small volume enema tube is used, the distance between the liquid surface of the enema drug and the anus should be <30cm, but it should be noted that the liquid should not be too low either to avoid regurgitation of liquid in the rectum.