Operation steps of enema:. (1) Prepare the materials to the bedside. The patient preparation and environmental preparation are the same as a large amount of enema, without reservation. (2) lubricate the anal canal, connect the gasket to the anal canal, exhaust and clamp the anal canal, insert it into the anal canal for 7~ 10cm, and loosen the clamp to make all the solution flow in. After washing, inject 5~ 10ml warm water. (3) Hold the anal canal and pull it out, and ask the patient to hold 10~20 minutes before defecation. (4) Arrange the bed unit, clean up the data and record.