The height of the bed has nothing to do with the catheterization operation, but only affects the ease of operation of the health care worker. The bed is very low, health care workers or squatting or sitting, posture slightly uncomfortable, may need to extend a period of operation time; the appropriate height, the appropriate bending standing, can increase the smoothness of the operation. Patients in the catheterization operation before the need to drain the acute lower urinary tract infection, urethral stenosis and other contraindications, and then obtain the consent of the patient or his family members before the catheterization operation. During the catheterization process, the patient should be asked to cooperate, pay attention to the concept of asepsis, and move gently. After the end of the operation, the patient and his family should explain the relevant precautions, such as preventing detachment of the catheter. Urinary catheterization is a common operation in the clinical process, when you need to catheterization must find a health care provider to deal with.