There are two meanings to the purging of the uterus: the first is that the residual tissue caused by incomplete medication abortion needs to be purged, as early as possible, the better. 10 days after the review, the judgment of the uterine cavity inside the residual tissue has been more than 1cm, to carry out timely removal of the uterus, to avoid the longer the residual tissue caused by the infection of the chances of occurring, because the more residual tissue, the more the chances of discharged through the way of oral medication will be relatively small, to carry out timely removal of the uterus. The second, the uterus can be carried out abortion surgery, when the pregnancy 42-55 days or so can be carried out the operation of the uterus, to help the gestational sac timely suction, to reduce the chances of bleeding occurs. Of course, the earlier the better, do not wait until about 60 days to carry out the operation, because the larger the month the higher the chance of bleeding.