The diagnosis of urethral stricture should not only clarify the presence or absence of urethral stricture, but also further clarify the site, number, degree, length of stricture, scar tissue around the stricture and the presence of complications such as bacterial infection, urethrorectal fistula, pseudo-tract, stone, diverticulum, previous surgical history and reasons for failure. Therefore, the preoperative examination of urethral stricture includes detailed history, urethral palpation, urethral probe examination, cystourethrography, urine culture + drug sensitivity, and urethroscopy if necessary to understand the distal segment of urethral stricture and the degree of stricture, while urethral ultrasonography, urethral magnetic resonance imaging, urethral CT imaging and other examinations developed in recent years provide more and better examination methods for the diagnosis of urethral stricture.