Female catheterization is usually performed in the lithotomy position, and after disinfecting the drape, a catheter is inserted into the bladder through the urethral opening. The female patient is placed in the lithotomy position with the hip and knee flexed and the legs elevated and adducted to expose the urethral opening completely. After the position, the local area was sterilized with iodophor, including the labia majora and minora as well as the nearby skin. After disinfection, cover the hole towel, and then carry out secondary disinfection, disinfect the urethral opening with iodophor cotton balls, use the hand to separate the patient’s labia minora, carefully disinfect the external urethral opening, and apply enough lubricant on the surface of the urethral tube, and then the catheter follows the external urethral opening, passes through the urethra and finally enters into the bladder until urine flows out of the urethral tube, and then further inserts the catheter into the urethra for 2-3 cm, and injects the water capsule at the head of the catheter tube with saline , which plays a fixed role to prevent the ureter from slipping off, and finally connect the drainage bag to complete the operation. When catheterization should be relaxed, do not be too nervous, cooperate with the doctor operation.