Clinically, termination of pregnancy at less than 28 weeks and fetal weight less than 1000g is called miscarriage; it is also divided into early and late miscarriage with 12 weeks as the boundary, and miscarriage occurring before 12 weeks is called early miscarriage. It is a special case of early miscarriage, which means that the embryo has died and is retained in the uterine cavity without being expelled naturally in time. When abortion occurs in early pregnancy, there may be the following signs: disappearance of early pregnancy reaction, little vaginal bleeding, paroxysmal lower abdominal pain, unopened cervical opening during gynecological examination, and a smaller uterus than the week of menopause. Some patients may not have any symptoms, so vaginal ultrasound is needed to assist in the diagnosis. If the fetal sac is not visible after more than 6 weeks of menopause, or if the fetal sac is deformed and wrinkled; if the fetal bud is not visible after the fetal sac reaches 4 cm, or if the fetal heartbeat is not visible after the fetal bud reaches 1.5 cm. All the above descriptions can be diagnosed as indolent miscarriage, i.e. aborted fetus. When there is an indolent miscarriage, most patients worry that they will not be able to have a healthy baby in the future. In fact, after the fertilized egg is laid in a normal pregnancy due to various factors, spontaneous miscarriage will occur in about 31% of patients, of which early miscarriage accounts for 80%, and the most common cause is chromosomal abnormality of the embryo or fetus. In other words, for women of normal childbearing age, the phenomenon of miscarriage should not be too panic or sad, the development process of embryo is like the history of human growth and evolution, it is the process of survival of the fittest, poor development in the early stage of pregnancy often indicates the existence of congenital deficiency of embryo. We need to make an outpatient appointment to remove the necrotic pregnancy tissue that is retained in the uterine cavity as soon as possible. This is because the risk of developing intrauterine infection increases significantly with time.