Normal abortion is a normal abortion. The main difference between an abortion and an auditory abortion is that the embryo in an abortion is fresh tissue and the risk of abortion is relatively small. The main difference between an indwelling abortion and an indwelling abortion is that the embryo is dead and the embryonic tissue is mechanized and then tightly attached to the uterine wall, making the procedure more difficult and the surgical operation more difficult than a normal abortion. Normal abortion has relatively less bleeding and better contraction of the uterus, and the probability of uterine perforation, abortion syndrome and missed aspiration is relatively low. Induced abortion is more difficult to perform because of its characteristics, and the probability of residuals is higher than that of abortion. No matter what kind of abortion, it is necessary to review the ultrasound after 7-14 days, and the reason why it is necessary to review the ultrasound after 7-14 days is that the probability of residuals is relatively high.