Abstract: Preterm birth is the leading cause of perinatal mortality. The incidence of preterm birth in twin pregnancies is high, and one of the reasons is cervical incompetence(CIC). Now there are no guidelines recommended in the world to predict CIC in twin pregnancies. The diagnosis is also based on medical history and physical examination. Prediction and diagnosis by ultrasound are difficult. The treatment methods and evaluation of effects are also controversial. We report a case for twin pregnancies which undergo emergency cervical cerclage with suture W6977 at 22+4 weeks gestation with the cervix dilated by 4 cm and infection is ruled out. The time from cerclage placement to delivery were 50 days with 2 live babies were born. The current research of the diagnosis and treatment for CIC in twin pregnancies is reviewed.

Key words: Pregnancy, twin；, Uterine cervical incompetence；, Cerclage, cervical；, Sutures；, Perinatal care；, Case reports