A normal pregnancy is delivered around 40 weeks, after 40 weeks of pregnancy, the function of the placenta is gradually declining, therefore, usually after 41 weeks of pregnancy, given to induce labor. An expired pregnancy is a pregnancy that is greater than or equal to 42 weeks and has not yet gone into labor is called an expired pregnancy. After 40 weeks of pregnancy, the function of the placenta is gradually declining, and at 42 weeks, it declines significantly. Therefore, after 41 weeks of pregnancy, consideration should be given to terminating the pregnancy, so as to avoid the occurrence of overdue pregnancy as much as possible. Overdue pregnancy is related to the imbalance of the ratio of estrogen to progesterone and the weakening of the uterine contraction stimulation reflex. After 42 weeks of gestation, the function of the placenta declines and amniotic fluid decreases, often leading to fetal distress, perinatal death, obstructed labor and other adverse outcomes. Therefore when the pregnancy reaches 41 weeks, obstetric intervention should be directed to choose the appropriate mode of delivery. If there is no fetal distress or placenta disproportionate, inducement of labor can be considered; if the placenta is dysfunctional or inducement of labor fails, cesarean section can be chosen. During pregnancy, pay attention to more rest, at the same time should relax, avoid tension, anxiety, any discomfort should be timely to the hospital, the doctor to clarify the diagnosis, and cooperate with the doctor to treat the symptoms.