The doctor can have the patient in a left lateral position with the body naturally flexed to expose the buttocks, the enema operator stands next to the patient and chooses the appropriate enema, some can use disposable enemas, some can use warm soapy water or saline, and different enemas are used depending on the condition. The operator puts on sterile gloves, adjusts the enema bottle to a certain height, pours the liquid used for the enema into it, lubricates the lower end of the enema with paraffin oil, and slowly inserts it along the anus for about 8-10 cm, releases the vascular clamp at the upper end, and slowly instills the liquid into the intestine, and the amount of liquid to be instilled should be decided according to the condition. In the case of colonoscopy, a cleansing enema can be taken, and the amount of enema should ensure that the food residue in the intestine is drained.