Normal bad dew is blood, and the endometrium of the uterus shedding, under normal circumstances there is no odor, there will only be some blood smell, if the bad dew appeared to smell to consider several reasons: 1, the existence of the placenta, fetal membranes of the residual, because the residual placenta, fetal membranes of the prolonged presence of the uterine cavity will be secondary to the infection, which led to the emergence of the smell of the bad dew, you can be determined by ultrasound examination. If the ultrasound suggests that there is placenta and fetal membranes remaining in the uterine cavity, timely removal surgery should be carried out to promote the discharge and prevent the aggravation of the infection; 2. Poor uterine regeneration leads to irregular shedding of uterine metaphase, and ultrasound examination is also needed to see if the endometrium is thicker. If the thickness is thicker and the blood level is high, it is recommended to perform a hysterectomy or apply drugs to promote uterine contraction to help discharge the meconium; 3. Puerperal infection, because many women over-warming during the puerperium will lead to an increase in body temperature, which can easily induce puerperal infections, and antibiotics are needed to treat this situation. Puerperal infection has some very common causes, may be bacterial infection, need to apply broad-spectrum antibiotic treatment, the treatment time will be longer.