Placental maturity level 2 at 34 weeks of pregnancy usually does not cause preterm labor, but at this time the placenta has matured and has a tendency to gradually age, and its ability to transport oxygen and nutrients may be reduced, so it is necessary to have regular obstetric checkups to ensure the healthy development of the fetus and delivery. Placental maturity is generally used to determine the function of the placenta, usually grade 1 at 30-32 weeks of pregnancy and grade 2 after 36 weeks of pregnancy, but the speed of placental maturity varies due to the different physical condition of individuals. If the placenta matures too early, due to calcification and fibrous deposits in the placenta, there is a certain possibility that it will affect the growth and development of the fetus, which will lead to premature delivery due to early placental abruption in the second trimester, and may also lead to intrauterine growth failure, intrauterine oxygen deprivation and other abnormalities in the fetus. However, whether or not it will be preterm delivery needs to be analyzed in conjunction with the physical condition of the pregnant woman, her mood, and the degree of fatigue. Therefore, placenta maturity of grade 2 at 34 weeks of pregnancy does not necessarily lead to preterm labor. Pregnant women in late pregnancy should eat a reasonable diet, supplement vitamins, proteins and other nutrients, pay attention to rest, avoid prolonged overwork. Pay attention to timely prenatal monitoring, strengthen high-risk screening and systematic management, and pay close attention to changes in placental maturity. Learn to count fetal movement and fetal heart rate monitoring, and seek timely medical attention when abnormal fetal movement is detected or when abnormalities such as vaginal bleeding or lower abdominal cramps occur, and take measures to deal with the triggers, so as to ensure a smooth delivery of the fetus after full term.