Vaginitis is the inflammation of the vaginal mucosa and submucosal connective tissue, and it is a commonly-seen disease in gynecology outpatient departments. For normal and healthy women, the vagina has natural defense functions against invasion of pathogenic organisms due to anatomical and biochemical characteristics. When the natural defense function of the vagina is destroyed, pathogenic organisms are prone to invade and cause vaginitis. Due to the lack of estrogen, the vaginal epithelium of young girls and menopausal women is thin, with reduced intracellular glycogen content and a vaginal pH as high as about 7; therefore, the vaginal resistance is low, so they are more susceptible to infection than adolescent and women of childbearing age.