Fetal arrest refers to the cessation of development of the embryo or fetus in early pregnancy for some reason. It occurs within 8 weeks of gestation and accounts for 80% of cases. Ultrasound examination shows that the fetal buds or fetuses in the gestational sac are irregular in shape and there is no fetal heartbeat, or the gestational sac is withered. With the increasing pressure of life, environmental pollution, the delay of young people’s age of marriage and childbirth, the increase of chronic inflammation of the reproductive system and repeated abortions, the incidence of fetal abortion is increasing year by year. It leads to infertility and also causes serious physical and psychological burden to both partners. However, what causes fetal abortion is not very clear, and the treatment lacks standardization. Professor Du Baojun of the Infertility Center of the Chinese Academy of Traditional Chinese Medicine believes that fetal abortion should be actively investigated for its causes, and advocates simultaneous examination of the couple and targeted treatment for the possible causes; while for fetal abortion with unknown causes in modern medical examination, both men and women can be treated according to different conditions, and treatment methods such as tonifying the kidney and filling the essence, warming the kidney and strengthening the yang, clearing dampness and heat, dispelling phlegm and activating blood are routinely used to increase the proportion of normal sperm, improve the endocrine level, and improve the sperm-egg level and union. The aim is to increase the proportion of normal sperm, improve the level of endocrine secretion, improve the level of sperm and egg and combine with the bed environment to achieve the purpose of conceiving a fetus. Du Baojun of the Fertility Center of Xiyuan Hospital of the Chinese Academy of Traditional Chinese Medicine will explain the symptoms, diagnosis, causes, prevention and treatment of fetal abortion. Symptoms: Once the pregnant mother’s pregnancy reaction feels less and less at 6-8 weeks after pregnancy, such as nausea, vomiting and other early pregnancy reactions disappear, and the feeling of breast swelling diminishes, these are likely to be the precursors of fetal abortion, some patients have vaginal bleeding, with dark red bloody leucorrhea, and some patients have lower abdominal pain, we suggest that they should go to the hospital for examination immediately. However, clinically, most pregnant women have no obvious symptoms after the fetus stops developing. Diagnosis: Patients with a history of menopause should have an ultrasound examination in early pregnancy, regardless of whether there is redness or not, to avoid missing the diagnosis of fetal arrest. ultrasound monitors embryonic and fetal development, if there is no gestational sac at ≥6 weeks, or if there is a gestational sac but deformed and wrinkled, when the gestational sac is ≥4cm but no fetal bud is visible, and the head and arm length of the fetal bud is ≥1.5cm but there is no fetal heartbeat, the embryo or fetus can be diagnosed with abnormal development. The last three cases can be diagnosed as fetal abortion. In addition, blood β-hcG measurement is also helpful for the diagnosis of fetal abortion. If ≥5 weeks, blood β-hcG