Bleeding in the eighth month of pregnancy may be caused by placenta praevia, placental abruption, cervical lesions and other reasons. 1. Placenta praevia: It refers to the position of the placenta reaching the endocervical os of the uterine cervix as suggested by ultrasonography after 28 weeks of gestation, which can cause painless vaginal bleeding in late pregnancy and can occur repeatedly. The combination of clinical manifestations and ultrasonography may assist in the diagnosis. It is necessary to strengthen the management of pregnancy and terminate the pregnancy at the right time according to the bleeding situation. 2. Placental abruption: it can also cause vaginal bleeding, accompanied by increased uterine tension and uterine pressure, uterus is hypertonic, fetal position is not clear to palpation, fetal heart rate slows down or disappears. Combined with the clinical manifestations and ultrasonography, blood routine, coagulation function and other tests, it can be clearly diagnosed, and need to terminate the pregnancy in a timely manner. 3. Cervical lesions: such as cervical erosive changes, cervical polyps, etc., can also cause vaginal bleeding, painless recurrent bleeding, ultrasound, gynecological examination and other assistance in diagnosis. Pregnant women eight months bleeding need to go to the hospital in time, and as soon as possible to identify the causes, and actively deal with.