There are many kinds of clinically used fetal protection drugs, which can be roughly divided into western and traditional Chinese medicines. I. Western medicine: 1. Progestin supplements: Commonly used progestin drugs include dydrogesterone, progesterone, etc., which are usually used in the case of low progesterone in early pregnancy. It can reduce the sensitivity of the uterus, avoid pre-eclampsia, and play a role in settling the fetus; 2, non-steroidal anti-inflammatory class: commonly used aspirin, to play the role of anticoagulation, mainly for patients with recurrent miscarriage caused by pre-thrombotic state, antiphospholipid antibody syndrome, etc. The drug may cause intracranial hemorrhage in the newborn through the placenta, so try to avoid using it in the month before delivery; 3, immunosuppressants: such as adrenocorticosteroids, etc., mainly For abnormal immune mechanism, especially autoimmune antibodies, such as anti-nuclear antibodies, anti-DNA antibodies, etc. caused by recurrent miscarriage patients; 4, β2 agonists: ritodrine hydrochloride can make the uterine muscle relaxation and then inhibit contractions, to play a role in fetal preservation; 5, calcium antagonists: such as magnesium sulfate can antagonize calcium ions, inhibit uterine smooth muscle contraction, and then play a role in fetal preservation, while applicable to pre-eclamptic pregnant women. 6, contractin receptor antagonist: atosiban for late pregnancy, inhibition of contractions is effective, can significantly prolong the pregnancy, and the mother tolerated better and less side effects; 7, vitamin E, folic acid: vitamin E can promote the body of pregnant women estrogen secretion, so as to prevent miscarriage. And folic acid can prevent fetal congenital neural tube malformation, by promoting fetal development to play a role in the preservation of fetus; 8, other western drugs: such as tranexamic acid is synthetic antifibrinolytic drugs, mainly used for pregnant women with a small amount of vaginal bleeding in pre-eclampsia; mebendazole is suitable for patients with pre-eclampsia caused by irregular contractions, lower abdominal distension or (and) vaginal bleeding before the 20th week of pregnancy for a variety of reasons. Chinese herbal medicine: 1. Chinese herbal tablets: there are more herbal tablets for fetus preservation, and strengthening the spleen and tonifying the kidneys is the main treatment method for fetus preservation in Chinese medicine. The Chinese herbal tablets commonly used to tonify the kidneys include cuscuta and mulberry seeds, while the Chinese herbal tablets commonly used to strengthen the spleen include atractylodes and yam. In addition, pregnant women can also take gum to nourish blood and calm the fetus under the guidance of herbalists. 2. Chinese patent medicines: Chinese patent medicines such as Zhi Kidney Fertility Pills and Embryo Capsules can also assist in preserving the fetus. Therefore, the fetal development in early pregnancy is not stable, and pregnant women are susceptible to external stimuli to produce signs of pre-eclampsia, but there are more types of fetal protection drugs in the clinic, pregnant women should not blindly use drugs at home to avoid drug toxic side effects that cause fetal malformation.