Which abortion method is the least harmful to the patient’s body depends on the patient’s specific physical condition and the relevant laboratory tests, and there is no uniform standard. If the patient is pregnant within 49 days, is intrauterine, has a gestational sac larger than 1.0 cm, and has no contraindications to medical abortion, medical abortion is the least harmful to the patient. If there are contraindications to medication abortion, then abortion, which is the least harmful to the patient. If the patient is pregnant between about 49 and 70 days and there are no contraindications to abortion, the abortion procedure is the least harmful to the patient. If the patient is within 70 days to 3 months of pregnancy, the choice of medical abortion plus the clearance procedure is the least harmful to the patient. If the patient is more than 4 months pregnant for induction of labor, it is less harmful to choose hydrocolloid induction of labor if the patient has a normal cervix and there is no contraindication to hydrocolloid induction of labor, taking into account the patient’s condition. If there is a contraindication to hydrosac induction of labor, there is the option of using intrauterine Levanox or indocin to induce labor, which are again the least harmful in comparison.