The operation procedure of catheterization for female patients, including position, disinfection, sheeting and catheterization, is as follows: 1. Position: generally let the patient lie in the supine position with the legs bent at the knees and then abducted to fully expose the entire vulva. 2. Disinfection: firstly, disinfection is performed from the outside to the inside of the perineum, the second is performed from the urethral opening, from inside to outside and from top to bottom, and the third disinfects the urethral opening again. 3. Sheeting: after disinfection is completed 4.Catheterization: first check the integrity of the catheter, lubricate the front end of the catheter with lidocaine slurry, then hold the front end of the catheter with forceps, find the urethral orifice and slowly send it in, the urethral orifice of women is relatively short, so after inserting 4-6cm, you can see urine flowing out of the catheter, then insert about 2cm inward, inject about Then, the catheter will be inserted about 2cm inward, and about 15mL of saline will be injected into the air sac, and finally the catheter will be gently pulled 1-2cm outward and connected to the drainage tube, and the whole process will be finished.