With the rapid development of assisted reproductive technology and the advanced maternal age，the incidence of multiple pregnancies has increased significantly，among which twin pregnancies are the most common. Multiple pregnancies，including twin pregnancies，may lead to unique complications，such as twin- twin transfusion syndrome，twin anemia polycythemia sequence，twin reversed arterial perfusion sequence，selective intrauterine growth restriction，chromosomal abnormalities or developmental abnormalities in one of the twins，etc. Some of them require intrauterine treatments such as fetoscopy and fetal reduction during pregnancy，which increases the risk of miscarriage and premature birth. Cervical cerclage can repair the morphology of the cervical ostiation，and give cervical canal support. Cervical cerclage also can prevent the continuous expansion of the cervical ostium effectively，and help prolong the gestational age and maintain pregnancy. It remains controversial whether intrauterine treatment with cervical cerclage can reduce the risk of miscarriage and preterm birth. This paper aims at this problem and makes a summary based on relevant literatures at home and abroad.