If the vagina always flows clear water, clinically it may be due to the following reasons: first, cancer of the fallopian tubes must be excluded. If there is cancer of the fallopian tubes, the main clinical manifestation is a large amount of watery vaginal discharge, and this discharge is odorless, and often there is a mass in the lower abdomen when carefully felt. Secondly, if there is a constant flow of water, the possibility of vesicovaginal fistula should also be ruled out. It is recommended that a detailed gynecological examination be done, combined with a comprehensive clinical history. If it is a vesicovaginal fistula, timely repair surgery should be given. Third, clinically it is necessary to exclude the possibility of vaginal inflammation. If it is bacterial vaginosis, there will also be watery discharge, but this discharge is often accompanied by a fishy odor, and a routine laboratory test of the white belt is needed.