Urinary extravasation is usually caused by urethral injury, which is the most common among urinary tract injuries. The male urethra is 17-20 cm and is divided into the anterior and posterior urethra by the urogenital diaphragm. The anterior urethra includes the head, penis and bulbous part of the penis, and the posterior urethra includes the membranous part and the prostate part. Due to its anatomical characteristics, the male urethra is easily injured. The female urethra is short and straight, 2.5 to 5 cm long, and has less chance of injury. The main manifestations of urinary extravasation include bleeding from the urethra, pain, difficulty in urination or inability to urinate, hematoma of the perineum, ecchymosis, etc., which are mostly caused by external factors. The incidence of the population to see the male majority, and often occurs in young men. There are many ways to diagnose urinary extravasation, and the diagnosis can be confirmed according to the history and signs. 1, urinary extravasation can be diagnosed according to the injury, typical symptoms and examination. Special attention should be paid to urethral injury and bladder injury. According to the site of catheter obstruction, the site of urethral injury can be estimated. The catheter should not be inserted too hard to avoid tearing the urethra. 2, rectal finger examination is very helpful in the diagnosis of urinary extravasation. Urinary extravasation, rectal palpation can be found to have obvious pressure pain. 3, suspected pelvic fracture can take X-ray film, urethrogram can make the extravasation of urine aggravation should be used with caution. The daily care of patients with urinary extravasation in the diet need to consume more appropriate protein, vitamin food. Postponement of eating time, while maintaining a smooth bowel movement, timely cleaning after the stool, to prevent contamination of the wound. Adopt the habit of drinking more water, the amount of water in 3000ML / day.