When menstruation is about to end, the color of vaginal bleeding is brown, which is a normal clinical manifestation. When menstruation is about to end, most of a woman’s uterine lining has been peeled off, only a small portion of the uterine lining is peeled off, and the small amount of peeled off uterine lining and blood, the stimulation power of the myometrium is weak. The contraction force of the myometrium is weaker, and the pressure in the uterine cavity is less when the uterine contraction force is weaker. The endometrium and blood can not be discharged from the body in a timely manner, the accumulation in the uterine cavity, will slowly pass through the cervix and vagina out of the body. If the blood and stripped endometrium in the body for a longer period of time will occur oxidation, become brown or black, or even become brown rotten meat-like tissue out of the body, which is normal. Only the patient’s menstrual period, within 2-8 days can be clean is normal, do not need to carry out special treatment. If the brown discharge exists for a long time, and the whole menstrual period is more than 8 days, it is an abnormal situation, and we need to do a comprehensive examination and deal with it according to the condition.