The length of the female urethra is roughly 3 centimeters to 5 centimeters, with an average length of 3.5 centimeters. The female urethra can be divided into upper, middle and lower parts. The tissue structure of the upper part of the urethra is consistent with the bladder neck, and the circular muscle of the bladder neck and the circular muscle of the upper part of the urethra are connected with each other, so that the neck is very hypertrophic; the middle part of the urethra has a random circular muscle in addition to the smooth muscle, this muscle layer is not very obvious, and there is some external sphincter; the lower part of the urethra refers to the opening of the urethra, which is without muscle. Women’s urethra is straight, the distance from the vagina and anus are relatively close, coupled with women’s urethra is relatively short, so it is very easy to be violated by bacteria, the emergence of urinary tract infection type of disease. Daily attention should be paid to the hygiene of the urinary system and the reproductive system, change underwear regularly, and wipe the toilet paper from the front to the back after defecation to prevent bacterial infections from occurring.