Studies have shown that oral Probiotics(Umeta-mimi) can significantly promote the recovery of vaginal flora mainly because intestinal microbiota can migrate and affect vaginal microecology. This project aims to evaluate the efficacy of oral Probiotics(Umeta-mimi,30 days) with Metronidazole vaginal suppositories(7 days) in the treatment of bacterial vaginosis (BV) and to explore the correlation between vaginal flora and fecal flora by detecting the metagenomics of vaginal secretions and intestinal feces at the time of baseline phase,14 days after treatment， the first month after treatment, 5-7 days after third menstruation after treatment and 5-7 days after sixth menstruation after treatment
