Miscarriages that occur in a natural state (not caused by an artificial purpose) are called spontaneous abortions. The incidence of spontaneous abortion is approximately 15% of all clinically confirmed pregnancies. Miscarriages that occur before 12 weeks of gestation are defined as early miscarriages and those that occur between 12 and less than 28 weeks of gestation are defined as late miscarriages. It is estimated that about 75% of all human pregnancies end in spontaneous abortion. In most of them, the embryo stops developing soon after implantation and manifests itself only as excessive menstruation or delayed menstruation, i.e. early abortion. In order to prevent and avoid spontaneous abortion, the following points should be noted: 1. Acute infectious diseases must wait for a period of time to heal before pregnancy. Chronic disease patients should be treated until the condition is stable and approved by a specialist before pregnancy. 2, for couples who have a history of miscarriage, should promptly go to the hospital to check the cause of the miscarriage, no matter which of the couple has a problem, should be treated in a timely manner, and then have a child after the cure. 3.Women who are pregnant should avoid exposure to harmful chemicals, such as benzene, mercury, radiation and so on. Early pregnancy should go to public places less often to avoid viral and bacterial infections. If a pregnant woman suffers from a disease, she should take medication under the guidance of a doctor in a timely manner and should not use medication at her own discretion. 4, early pregnancy (within 12 weeks of pregnancy) in addition to pay attention to dietary hygiene and avoid excessive exertion, but also to avoid excessive tension, to maintain emotional stability, in order to facilitate the safe fetus. Do not have intercourse in the first 3 months of pregnancy. If, after examination, the fetus is developing abnormally, the doctor thinks that scraping should be done, the patient should not delay, so as not to cause excessive blood loss (or even shock, death) or the formation of inflammation of the internal genitalia affecting future fertility, knowing that most of the aborted embryos are generally congenital defects, belong to the natural elimination of the list, do not lose a lot because of the small, endangering the health of pregnant women.