Urinary stones are formed in the kidneys and bladder, and the vast majority of ureteral stones and urethral stones are caused by the process of stone expulsion, which stays in the place. Urinary stone damage to the body is mainly in the urinary system, the degree of damage depending on the size and location of the stone and different, the main damage for the urinary tract obstruction, secondary infections and epithelial lesions, stones, obstruction and infection of each other as a cause and effect, the formation of a vicious circle, that is, the stone caused by the obstruction, obstruction caused by the infection, and the infection promotes the stone.