Urinary fistula is one of the most painful conditions for women and often manifests as a constant flow of urine. Urinary fistula often wets the pants and affects other people around. As a result, it can cause great physical and mental harm to the patient. The examination methods of urinary retention: 1, urography The most commonly used in patients with urinary fistula is excretory urography. Intravenous injection of contrast medium after X-ray film, such as good renal function of the urinary tract without obstruction, kidneys, ureters, bladder are well visualized, so as to understand the various parts of the lesions and the degree of lesions. If one side of the kidney is not functioning well, then the X-ray film does not show up or does not show up well, in order to determine the nature of the lesion, retrograde imaging can be done to further confirm the diagnosis. 2, renogram Through renogram analysis, we can understand bilateral renal function and upper urinary tract patency. If the ureterovaginal fistula is complicated by one side of renal hypoplasia and delayed urinary excretion, it indicates that the ureterovaginal fistula is on that side, and if both kidneys are impaired, it suggests that there is the possibility of urinary tract tuberculosis. 3, ultrasound Doppler examination is mainly used to diagnose vesicovaginal fistula. The bladder is filled with saline, ultrasound Doppler examination is filled with ultrasound medium, the presence of fistulae in the bladder wall can be seen jet phenomenon, the diagnostic sensitivity can be compared with cystoscopy, urography, and non-invasive, non-radiation. 4, probe examination with uterine probe gently inserted from the urethral orifice, can measure the length of the urethra, to understand the urethra with or without stenosis or atresia, can be found smaller fistula, the probe can be through the fistula hole into the vagina. The probe can also enter the bladder to check for stones.