Twins need to use at least 2 fetal heart monitor bands to monitor the fetal heart by fixing them at the strongest part of the fetal heart. When measuring the fetal heartbeat of twins, both fetal hearts should be detected, so it is necessary to fix the probe of the monitor in the strongest part of the fetal heartbeat by two fetal heartbeat monitoring belts to avoid moving. When using the fetal heart monitor belt, pay attention to the appropriate looseness and tightness, to avoid too tight pressure on the uterus, while avoiding slippage, the probe of the uterine cavity pressure should also not be loose or tight, to ensure that the probe does not move in this position. Twins pregnant women should relax during pregnancy, avoid excessive anxiety, if you find abnormal fetal heart monitoring or other abnormalities, timely medical improvement of relevant examinations, standardized treatment.