Spontaneous abortion is defined as a pregnancy that terminates spontaneously before 28 weeks and the fetus weighs <1000g. Miscarriages occurring before 12 weeks of pregnancy are called early abortions, while those occurring at 12 weeks are called late abortions. Spontaneous abortion is a common disease in obstetrics and gynecology, and untimely treatment may cause inflammation and damage to the reproductive tract or endanger the life of the pregnant woman due to hemorrhage. The causes of spontaneous abortion can be divided into embryonic factors and maternal factors. The common causes of early miscarriage include embryonic chromosomal abnormalities, maternal endocrine abnormalities, reproductive organ malformations, reproductive tract infections, local or systemic immune abnormalities in the reproductive tract, etc.; late miscarriage is mostly caused by cervical insufficiency, maternal and child blood type incompatibility, etc. Many women who have experienced miscarriage are worried that they will have another miscarriage when they get pregnant again. In fact, the majority of miscarriages can be prevented, to prevent the occurrence of miscarriage should pay attention to the following aspects: 1, age-appropriate pregnancy, the best age for women to give birth to 25 to 29 years old, too young will be due to immature body development and easy to miscarriage, too old will be due to reduced reproductive function, chromosomes prone to mutation and miscarriage. 2, good family planning, to avoid the damage to the uterus of abortion for unwanted pregnancy. 3, after the miscarriage should be more than six months interval, wait for the uterus to fully recover, the whole body of Qi and blood recovery before pregnancy. 4, do a good pre-pregnancy medical examination, especially women with a history of miscarriage should do a comprehensive examination, if found to have some aspects of the disease, should be treated first, after the disease is cured before pregnancy. 5.Avoid contact with toxic substances after pregnancy; avoid strenuous exercise; avoid rough sex; do not smoke, do not drink; eat less or no stimulating food; avoid bad emotional stimulation, maintain a good state of mind; before and after pregnancy should avoid contact with pets; avoid unclean sex life. At the same time, family members should give the pregnant woman full understanding and care.