A fetus that is not yet full term and is delivered spontaneously without viability is called a miscarriage. There are several reasons for miscarriage: first, fetal or placental factors, abnormal development of the embryo or placenta. Second, maternal factors, such as endocrine disorders, acute infectious diseases, chronic diseases, malnutrition or drug intoxication, uterine fibroids, short cervix, posterior tilt of the uterus, etc. Third, external factors, such as surgery, trauma, sexual intercourse, exercise, mental stimulation, etc. Health care measures: 1, after pregnancy should pay attention to nutrition, moderate work and rest, mental peace, do not overwork, avoid strenuous exercise, do not overload, avoid lower abdominal collision. 2, within three months of pregnancy, after seven months should be prohibited intercourse, otherwise it is easy to lead to miscarriage, premature birth. The rest of the time must also prevent sexual intercourse pressure damage to the fetus. 3, within the fourth month of pregnancy, avoid abdominal surgery as far as possible; do not contact with rays, pesticides, do not take drugs that are harmful to the fetus. 4, once the aura of miscarriage appears, should be absolutely bed rest and active treatment. However, in the early stage of pregnancy, most of the cases of pre-eclampsia miscarriage are embryonic developmental malformation, so there is no value of fetal preservation at this time.