Fetal heart monitor is a medical device that provides continuous monitoring, display and recording of fetal heart rate (FHR), and tests and monitors prenatal uterine function (UA). It can show fetal health by measuring fetal heart rate (FHR). It is widely used in the medical gynecological prenatal examination industry. Generally, fetal heart monitors can be divided into medical fetal heart monitors and household fetal heart monitors. The use requirements of medical fetal heart monitor are relatively high, and can only be used by trained medical staff in hospitals, clinics, clinics and patients' homes. However, the use requirements of household fetal heart rate monitors are relatively simple. After simple training, users can use them in daily fetal heart rate testing. The following is a brief analysis of several popular fetal heart monitor designs.