Checking the length of the cervix can be done through gynecological examination and ultrasound. 1. Gynecological examination: women adopt the truncated position, i.e. lying on their backs on the examination bed, with their legs on the leg supports, exposing the perineum to the maximum extent possible, and the doctor can use a sterilized finger wearing gloves to reach into the vagina for examination in order to find out the length of the cervix. 2. Ultrasound: It is a non-invasive examination, more convenient, and more accurate measurement value, can be examined through the abdomen, can also be examined through the vagina, the examination through the abdomen usually need to hold urine in advance. If a woman finds that her cervix is not in the normal range when checking the length of her cervix, it is recommended that she consult a doctor in a timely manner, and under the guidance of the doctor, improve the relevant examinations to clarify the cause of the disease and target treatment.