The use of triple-lumen urethral catheter mainly includes preoperative preparation, disinfection and insertion, connection of drainage bag, retention and fixation, flushing and other steps. Three-lumen urinary catheter general urology, tube diameter is slightly thicker than the ordinary catheter more than a flushing lumen and the tip of the drainage lumen has a common opening; mainly used for urology after transurethral surgery need to flush the situation. 1. Pre-operative preparation for catheterization: the equipment required for catheterization is basically the same as that for ordinary catheterization, and the three-lumen urinary catheter is ready. 2. Sterilization insertion: general perineum, urethra with povidone-iodine fully disinfected, lubricated urinary catheter gently and slowly inserted into the urethra, generally about 2 to 4cm for women, about 20cm for men, about 1 to 2cm can be inserted after seeing the urine outflow. 3. Connect the drainage bag: generally the middle interface for the drainage lumen, connect the drainage bag to drain the urine, to prevent urine contamination of the field of operation, a long period of time should be retained to close the pipe, regular discharge of urine. 4. Fixation of urinary catheter: the urinary catheter should be fixed properly, usually with color marking of the interface for the fixation of the balloon lumen, injected with 10-15 ml of saline can be. 5. Flushing: Generally the thinner interface is the flushing lumen, which can be injected with water or drugs into the bladder for flushing or treatment. Three-lumen catheter should be used by professional medical personnel, strict aseptic operation, prevention of infection, pay attention to care; do not operate without authorization, find abnormalities promptly notify the physician to deal with.