The passing criteria for fetal heart rate monitoring are the fetal heart rate, the magnitude of the change in the fetal heart rate, and the fetal movement within 20 minutes. The qualified criteria are as follows: 1. the limit of fetal heart rate is 110-160 beats per minute within 20 minutes; 2. the fetus has at least 2 fetal movements during this 20-minute period, during which the fetal heart rate accelerates to at least 15 beats per minute more than the baseline fetal heart rate and lasts for at least 15 seconds each time; 3. there is no deceleration or occasional variable deceleration of the fetal heart rate lasting no more than 30 seconds; If the above three criteria are met, the fetal heart rate monitoring result is satisfactory and means that the fetus is currently in good condition. If there are occasional failures of fetal heart monitoring, the pregnant woman should eat a full meal before the fetal heart monitoring to avoid the starvation state that leads to the failure of fetal heart monitoring, but there may also be cases of fetal hypoxia, and at this time, it is necessary to repeat the examination after oxygen intake. If the fetal heart monitor failed several times, it may suggest that the fetus is in intrauterine distress, and then need to be hospitalized.