The following cases require cervical cerclage: i. In case of cervical insufficiency, as the pregnancy progresses further and the fetus increases in size, there is often a sudden discharge of the pregnancy products out of the vagina without pain, so it is recommended to do cervical cerclage so that the pregnancy can reach full term. Secondly, if you have placenta praevia and have an annuloplasty, it may prevent the extension of the lower part of the uterus and make the cervical opening dilate, so clinically this condition can also be done with an annuloplasty. In twin or multiple pregnancies, premature rupture of the membranes or preterm delivery may occur due to excessive expansion of the uterus. It is recommended to do cervical cerclage to extend the number of days of pregnancy so that the survival rate of the fetus can be increased, so the indications for cerclage should be strictly controlled so as to ensure further continuation of the pregnancy.