Female catheterization operation process: 1. The first step should be wearing a mask, a hat and sterile gloves. 2. The second step should be disinfecting the perineum, firstly from the outside to the inside, and the second time from the inside to the outside. 3. The third step should be checking whether the urethra and balloon are broken, and if they are normal, the urethra should be cleaned effectively and lubricated. 4. The fourth step should be disinfecting the urethral opening again, and smoothly Insert the urethral tube into the urethra, usually insert 4-5cm, and urine will flow out. Push inward 2cm again, use a 10ml syringe, fill the balloon with 10ml of water, and then leave the urethra for fixation.