During pregnancy, such as abdominal pain, abdominal distension and vaginal bleeding, modern medicine calls it threatened abortion. For threatened abortion, traditional Chinese medicine can choose drugs to prevent miscarriage. There are many traditional Chinese medicines for preventing miscarriage, which mainly include the following categories: clearing away heat and preventing miscarriage: it is suitable for the restless fetus caused by fetal fever, and the commonly used ones are Scutellaria baicalensis Georgi and ramie root. Scutellaria baicalensis Georgi is cold in nature and bitter in taste, and has the efficacy of clearing away heat, purging fire and preventing miscarriage. It is mainly used for fetal movement disorder caused by qi-heat, and is often combined with Atractylodes macrocephala and Angelica sinensis. Hemp root is cold and sweet, and has the effects of clearing away heat and cooling blood, stopping bleeding and preventing miscarriage. It is mainly used for fetal movement disorder caused by blood heat, and is often combined with Scutellaria baicalensis Georgi, bamboo shavings, Rehmannia glutinosa, Angelica sinensis and Colla Corii Asini. Regulating Qi and Preventing Fetuses: It is suitable for restless fetus due to qi stagnation. Perilla frutescens and Amomum villosum are commonly used. Perilla frutescens is warm, pungent, and can promote qi circulation, relax the middle warmer and prevent miscarriage. It is used for fetal restlessness caused by wind-cold and cold during pregnancy and qi stagnation of spleen and stomach. It is often combined with Pericarpium Citri Tangerinae and Fructus Amomi. Amomum villosum is warm in nature and pungent in taste, and has the functions of activating qi, regulating middle energizer, stopping vomiting and preventing miscarriage. It is used for fetal movement disorder caused by deficiency of middle energizer and qi stagnation, and is often combined with Atractylodes macrocephala and Peristal Rhizome. Spleen-invigorating and fetus-preventing: it is suitable for fetal movement with weak temper, and the commonly used medicine is Atractylodes macrocephala. Atractylodes macrocephala is warm in nature and sweet in taste. It has the effects of invigorating qi and spleen, harmonizing middle warmer and preventing miscarriage. It is used for fetal movement disorder caused by spleen deficiency and weak qi. It is often combined with dried tangerine peel, Poria, Codonopsis pilosula and ginger. Tonifying liver and kidney and preventing fetus: it is suitable for fetal movement disorder due to liver and kidney deficiency. Eucommia ulmoides Oliv., Dipsaci Radix and Taxilli Herba are commonly used. Eucommia ulmoides Oliv. is warm and sweet, and has the effects of nourishing liver and kidney and preventing miscarriage. It is used for fetal movement uneasiness caused by liver and kidney deficiency and unstable fetus. It is often combined with Radix Dipsaci and Rhizoma Dioscoreae. Dipped with mild temperature, bitter and pungent taste, it has the effects of nourishing liver and kidney, promoting blood circulation and preventing miscarriage. It is used for fetal movement due to liver and kidney weakness and imbalance of chong and ren, and is often combined with Taxilli, Semen Cuscutae and Colla Corii Asini. Mulberry parasitism is flat, bitter in taste, and has the effects of nourishing liver and kidney, nourishing blood and preventing miscarriage. It is used for miscarriage, bleeding and restless fetus caused by deficiency of liver and kidney, and is often combined with Folium Artemisiae Argyi, Colla Corii Asini and Eucommia ulmoides Oliv. (Cheng Huaimeng)