Female urinary catheterization that is indwelling catheterization operation, the method of flow is mainly divided into pre-catheterization preparation, disinfection, insertion of catheter catheterization, tidying up the items and records. 1. Preparation before catheterization: It mainly includes checking the patient’s information before catheterization, preparing the catheterization bag and other items needed for catheterization of the patient, the patient takes the supine bent-knee position, removes one side of the trouser leg, and exposes the perineal area by spreading the legs. 2. Disinfection: Wear sterile gloves, use 0.5% povidone-iodine cotton balls to wipe and disinfect the perineal area in the order of mons pubis, labia majora, labia minora, vaginal opening, urethral opening and anus; after spreading the sterile towel, change the sterile gloves, and use povidone-iodine to disinfect the perineal area again according to the order of urethral opening, bilateral labia minora and urethral opening. 3. Catheterization: the thumb and forefinger of the left hand are separated to fix the labia minora, insert the catheter coated with paraffin oil at the front into the urethral opening for 4-6cm, see the catheter out of the urine and then into the 1-2cm, use a sterile syringe to inject about 10ml of saline into the balloon, pulling the catheter outward can be done when there is resistance, insert the drainage bag and fix it to complete the operation. 4. Organize items and records: after the completion of urinary catheterization, take urine specimens, remove the items used, and record the time of catheterization, the volume of urine, and the color of urine. Female urinary catheterization should be operated by professional personnel, do not operate on your own to avoid complications such as urinary tract infection.