There are many causes of recurrent spontaneous abortion, anatomical anomalies account for 10%, mainly any preparation that affects the blood flow to the uterus and the endometrial implantation will cause miscarriage. Congenital malformations of the uterus are a common cause of early miscarriage. Uterine malformations include longitudinal uterus, unicornuate uterus, bicornuate uterus, etc., resulting in small uterine cavity that cannot expand to accommodate embryonic development and expulsion, and poor blood flow to the longitudinal uterus, which is not suitable for embryonic development. Abnormal congenital development of the cervix or the trauma of abortion during early pregnancy causes the cervical opening to be loose and unable to withstand the pressure in the uterine cavity as the fetus increases in size, resulting in miscarriage. In recent years, the number of intrauterine operations has increased, resulting in a significant increase in traumatic formation of uterine adhesions, which deform the uterine cavity and, in heavy cases, affect the formation of the bed and placenta and cause early miscarriage. The incidence of fibroids is high in women, and when the submucosal fibroids are large, they block the uterine cavity and affect the implantation of the placenta, resulting in miscarriage. Uterine deformities can be treated with plastic surgery, fibroids can be treated with myomectomy or ultrasound focused knife, uterine adhesions can be separated under hysteroscopy, and in cases of loose endocervical opening, endocervical ligation should be performed at 16-20 weeks of gestation.