Women who terminate their pregnancy by pedestrian abortion, in the course of which the pregnancy sac has been sucked out directly from the uterine cavity, will experience a relatively rapid decline in HCG after the operation. Its decline pattern, mostly in the week after the operation was a sharp decline in the decline in the week after the decline in HCG has not fully returned to normal, then there will be a slow decline in the situation, in the abortion about half a month after the recheck HCG will see HCG is negative performance. If a woman has an incomplete abortion as a result of the abortion procedure, HCG will decline more slowly. It is recommended that about half a month after the abortion, the ultrasound should be routinely repeated to see the specific situation of the uterine cavity.