Normal fetal heart rate is between 110-160 beats/min, but a fetal heart rate of 170 beats/min does not necessarily mean danger, and needs to be analyzed specifically: 1, early pregnancy: fetal heart rate tends to increase slightly, usually between 120-180 beats/min. This slight increase is a normal reaction, due to the female body’s reaction to pregnancy, resulting in its own heart rate increase, which in turn causes the fetal heart rate increase. 2, late pregnancy: the normal heart rate of the fetus in the middle and late pregnancy should be between 110-160 beats / min. At this time the fetal heart rate reaches 170 times / min, if the heart rate within a short period of time back to the normal range, this is generally due to the baby’s activities in the pregnant woman’s body caused by the acceleration of the heart rate, is a normal phenomenon; if the fetal heart rate reaches 170 times / min and a long time does not decline, need to consider the existence of intrauterine hypoxia, it is recommended that obstetrics ultrasound, fetal heart monitoring and other checks, so as to avoid the emergence of intrauterine distress of the fetus, affecting the development of growth and development, mental retardation, malformation, or even the emergence of This is to avoid intrauterine distress, which may affect the growth and development of the fetus and pose a risk of mental retardation, malformation, or even growth stagnation. In addition, if the mother has a fever, the rapid heart rate will also cause the fetal heart rate to increase, and the fever can be recovered.