Intermittent catheterization that fails to drain on its own halfway through may be due to incorrect insertion of a urinary catheter that fails to enter the bladder, and can be reintroduced by an experienced healthcare professional. Intermittent catheterization can relieve the patient’s urinary retention, while avoiding retrograde urinary tract infections caused by repeated continuous catheterization, and can be used in the treatment of conditions such as neurogenic bladder. During the operation, the left hand exposes the external urethral opening, the right hand holds the catheter, and the catheter is slowly and gently inserted through the external urethral opening. In women, the urinary catheter is inserted into the urethra for 4~6cm, and then 1~2cm after seeing urine, fixing the urinary catheter and draining the urine. In male patients, the catheter is inserted into the urethra for 20~25cm, and then 1~2cm after seeing the urine, fixing the catheter and draining the urine. Intermittent catheterization in the middle of their own discharge, should be timely consultation, clear cause, under the guidance of the doctor for treatment.