If the vaginal discharge after menstruation has an odor, it is most often caused by anaerobic bacterial infection of the vagina. In the menstrual period due to the body resistance decline, it is likely not timely change sanitary napkins, resulting in local anaerobic bacterial reproduction in the vagina, so it will make Gardnerella infection, resulting in bacterial vaginosis, vaginal secretions will have a great fishy odor, it is recommended that it is best to be through the laboratory examination of the routine of the leukorrhea, to find out whether there is an infection of the BV, and if the BV positive, it is recommended that it can be used with metronidazole pessary plugged into the If BV is positive, metronidazole pessary can be inserted into the vagina for treatment. If the routine leukorrhea is normal after laboratory examination, cervical cancer and endometrial cancer can be ruled out, ultrasound examination can be done for cervical cancer screening, and further diagnosis can be given in the clinic.