Male urinary catheterization refers to male catheterization, and the steps are divided into preoperative disinfection, preoperative examination, local masking, insertion of urinary catheter, injection of saline, connection of urinary bag, and disinfection. The specific steps are as follows. 1. Male catheterization will firstly disinfect the outer opening of the male urethra, if the outer opening of the male circumcision urethra has been wrapped up, the foreskin needs to be turned up to the outside, and at the same time, the glans and the foreskin will be disinfected to avoid bacterial infections during the operation. 2. After completing the sterilization, it is necessary to inspect the urethra and water bladder to check whether they are intact and whether there is any quality problem, and after that, the tissues and hairs around the penis will be covered with a sterile sheet. 3. After the preoperative preparation, the doctor can use gauze to wrap the penis and lift it up, as far as possible to let the foreskin in the state of flap, at this time, you can use tweezers to hold the urinary catheter, after applying lubricant, the urinary catheter through the urethral orifice into the urethra, up to the bladder, and see the urinary catheter outflow of urine, then it means that the urinary catheter has been entered into the bladder. 4. Inject 10~15ml of saline into the bladder, fix the urethra, then connect the urine bag and remove the sterile bag. It is recommended that patients stay in the hospital for a period of time after the operation to prevent discomfort. If men need catheterization, it is recommended to be operated by professional medical personnel in regular hospitals.