The short cervical canal in the fourth month of pregnancy is prone to miscarriage and preterm labor and requires a range of clinical management options. It mainly includes surgical treatment and daily care. 1. Surgical treatment: In general, in the fourth month of pregnancy, cervical cerclage can be performed vaginally to change the condition of the cervical canal by means of artificial fixation, so as to avoid miscarriage and preterm labor. 2. Daily care: if the cervical canal is already abnormal, you should pay attention to avoiding the increase of abdominal pressure, avoiding stooping and weight bearing, avoiding too strenuous exercise, paying attention to rest, do not exert oneself, paying attention to a balanced diet, avoiding the situation of constipation. If the cervical canal is short and accompanied by abdominal pain and contractions and other symptoms, you need to be admitted to the hospital in time to diagnose the specific physical condition, under the guidance of the clinician to carry out standardized treatment, to avoid delaying the condition.