In general, the rate of uterine rupture in second pregnancies after cesarean section is related to the thickness of the uterine scar, the presence of placental implantation, and the time between pregnancies. 1. Thickness of uterine scar: If the thickness of uterine scar is too low, the risk of uterine rupture will be higher; on the contrary, it will be lower. 2. Whether there is placental implantation: If there is placental implantation, then the scar may rupture during the growth of the placenta, leading to uterine rupture. 3. Interval between pregnancies: If the interval between two pregnancies is too short and the scar has not fully recovered, then the chances of uterine rupture after pregnancy will also be much higher. In order to avoid uterine rupture after cesarean section, pregnant women should pay attention to good maternity examination, encounter abnormalities in time to consult a doctor, under the guidance of the doctor to improve the relevant examination.