The length of bed rest after placenta praevia needs to be decided on a case-by-case basis and cannot be generalized, but bed rest does not lead to a change in the position of the placenta. In case of complete or partial placenta praevia, it is difficult to grow up through bed rest, while in case of low placenta in placenta praevia, it is possible to grow up with bed rest for at least 4 weeks, the exact length of which varies from person to person. In complete placenta praevia, the placental tissue covers the inner cervical opening completely, while in partial placenta praevia, only part of the placental tissue covers the cervical opening, relatively speaking, low placenta is less severe in nature among the types of placenta praevia. Placenta praevia can easily lead to miscarriage and preterm labor, bed rest can prevent bleeding, bed rest for 4 weeks is recommended, if the patient is in poor physical condition, the bed rest time can be extended. In addition, when patients with placenta previa are on long term bed rest, they can adopt left side lying position, do not exert too much force when changing position, keep a calm mind, avoid strenuous exercise, avoid constipation and sexual intercourse, closely observe vaginal bleeding and go to hospital obstetrics and gynecology department immediately if bleeding is found.