Cervical canal 23mm in 20 weeks of pregnancy is better to stay in bed and reduce activities, otherwise it may cause miscarriage, preterm labor and so on. Cervical canal 23mms at 20 weeks of pregnancy belongs to the situation of short cervical canal, if the cervical cerclage has been performed, generally do not need to be absolutely bedridden, if not, then need to be absolutely bed rest. Short cervical canal may lead to miscarriage. During the bed rest period, pay attention to observe whether there is any vaginal bleeding of preterm miscarriage or preterm labor. In addition, according to the specific circumstances, to determine whether it is necessary to hospitalize the birth control treatment, such as follow the doctor’s instructions intramuscular injection of progesterone injection, etc.. And also to absolutely prohibit sexual intercourse, in the diet should also pay more attention to, eat some nutritious and easy to digest food, to ensure that the bowel movement, to prevent constipation. Clinical short cervical canal during pregnancy is more dangerous, so we must choose the appropriate treatment plan according to their own situation, to minimize the possibility of preterm delivery.