The urethra and the vagina are not the same. The difference is mainly in the following aspects: first, they belong to two channels and their roles are not the same. The urethra of women is very short and narrow, about 4-5cm in length, while the vagina of women is about 7-8cm long, relatively wide, very elastic and with a large number of vaginal folds; thirdly, the clinical symptoms are different when pathological changes occur. Vaginal lesions are mainly manifested by bleeding, abnormal leucorrhea, vaginal discharge, etc.