The presence or absence of fetal arrest can be determined by ultrasound at 16 weeks of pregnancy. At 16 weeks of pregnancy, the fetal heartbeat is already present, so the presence of fetal arrest can be inferred by ultrasound examination of the presence of a fetal heartbeat, and if no fetal heartbeat can be detected, the possibility of fetal arrest needs to be considered. Fetal arrest is most often caused by problems with the fetus itself, and embryo testing may reveal chromosomal abnormalities. In addition, uterine abnormalities, insufficient progesterone due to luteal insufficiency, and some immune-related problems may also lead to fetal arrest. Therefore, ultrasound examination is required at 16 weeks of pregnancy to determine fetal arrest, and timely medical attention is required in case of fetal arrest. Once fetal arrest is diagnosed, the pregnant woman should terminate the pregnancy immediately through abortion under the guidance of the doctor.