The reasons for the absence of fetal heartbeat in pregnancy include physiological reasons, embryonic dysplasia, embryonic arrest and so on. 1. Physiological reasons: when the pregnancy is short or the menstrual cycle is long, there will be no fetal heart in the ultrasound examination, which can be verified by the size of the gestational sac or according to the pregnant woman’s own menstrual cycle to check the gestational week, and then under the guidance of the doctor for temporary observation and review. 2. Embryonic dysplasia: it will lead to the situation that the ultrasound suggests that there is no fetal heart, and the level of progesterone or blood HCG (human chorionic gonadotropin) is on the low side, so it is necessary to follow the doctor’s advice to give progesterone, low molecular heparin and other medicines to preserve the fetus, and to follow the doctor’s advice to recheck the situation after 7 to 10 days of treatment. 3. Embryonic Fertilization: ultrasonography will also lead to the absence of fetal heart, progesterone and blood HCG level Y is also relatively low, fertility preservation treatment is ineffective, it can be suggested that the embryo is arrested, need to comply with the doctor’s advice to terminate the pregnancy in a timely manner. Pregnancy without fetal heart need to find the cause under the guidance of the doctor, and timely treatment.