Painless abortion can be considered within 60 days of pregnancy, and the best time is between 35-50 days of pregnancy. During 35-50 days of pregnancy, the uterus is relatively small, the myometrium is still thick, and the fetus and placenta are not yet formed, the placenta and uterine wall are not particularly close together, so it is easier to suck out the embryonic tissue, less damage to the endometrium, shorter operation time, less bleeding and faster recovery after the operation. If this time is exceeded, the fetus will be larger and more harmful to the pregnant woman’s body. Painless abortion is also not recommended if the pregnancy is short, because at this time the embryo is small in size and there is a certain risk of missed suction. After the painless abortion, patients need to pay attention to rest and warmth, avoid getting cold, should not be strenuous exercise in the short term, pay attention to keep the perineum clean and hygienic, at the same time need to pay attention to diet and nutrition, which is conducive to post-operative recovery.