The death of a fetus before delivery is called stillbirth in China，which is after 20 weeks of gestation.The incidence of stillbirth directly affects the perinatal mortality，which is a sensitive indicator of medical quality in a region and a country.There are usually some traces before stillbirth occurs.The key to prevent stillbirth and improve the quality of obstetrics is to correctly identify high-risk factors，strengthen the management of pregnancy，and effectively use the means of detection.