The so-called urinary catheter refers to the catheter, men and women insert the catheter in different ways, mainly divided into the insertion of the catheter before the preparation, disinfection and insertion of the catheter. 1. Preparation: Before catheterization, wash hands, put on a mask, prepare relevant items needed for catheterization, such as catheterization bag, etc. After checking the patient’s bed number and name, the patient is asked to take the supine position, with legs flexed and adducted to fully expose the perineum for catheterization operation. 2. Disinfection: Put a therapeutic towel under the buttocks, put on sterile gloves, and use 0.1% Neosporin or 0.1% Chlorhexidine to disinfect the cotton balls. The order of disinfection is from the inside to the outside, men wipe the pubic mound, scrotum, penis, and women wipe the pubic mound, labia majora, labia minora, urethra and anus. After disinfection, lay a sterile towel and prepare for intubation. 3. Catheterization: male catheterization requires one hand to use sterile gauze to fix the penis, so that the penis and the abdominal wall at an angle of 60 degrees, the other hand to hold the vascular clamp clamp catheter front end aligned with the urethral orifice inserted into the about 20 ~ 22cm, see the catheter mouth urine outflow, then inserted into the 1 ~ 2cm, urine into the treatment bowl can be used to lead the catheter fixed with adhesive tape. Female catheterization requires the physician’s left thumb and forefinger apart to fix the labia minora, exposing the urethral opening, the right hand holding the vascular clamp clamped catheter front inserted into the urethra of about 4~6cm, see urine outflow, then inserted into the 1~2cm can be, the outflow of urine into the treatment bowl, the use of adhesive tape to fix the catheter can be. The catheterization needs to be carried out by a professional physician, and pay attention to the aseptic operation to avoid causing complications such as urinary tract infection.