The susceptible site of cervical lesions is the area of the migratory zone between the squamous epithelium-columnar epithelium junction. Due to the repeated changes in the migratory zone, the immune system of the cervical transformation zone has weakened its ability to recognize and respond, and becomes a weak link, which is susceptible to infection by foreign pathogens and viruses. Therefore, the cervical opening and migratory zone are the source of cervical lesions and are the key areas for curing cervical lesions. What are the tests for migratory lesions? Cervical cytology: it is the preferred initial screening method for cervical lesions and the most effective method for cervical cancer screening. If TCT is carried out on a large scale and in a standardized manner, and followed by scientific and standardized diagnosis, treatment and follow-up, the incidence and mortality rate of cervical cancer can be significantly reduced. Colposcopy: It is to use colposcope to magnify the epithelium of cervical-vaginal area 10-40 times under the irradiation of strong light source for direct observation, in order to observe the tiny lesions that cannot be seen by naked eyes, and to conduct localized biopsy in the suspected area, so as to improve the diagnosis rate of cervical diseases. Cervical biopsy: Cervical biopsy is a biopsy of the uterine cervix, i.e., a small piece or several pieces of tissue are taken from the cervix for pathological examination to determine the diagnosis. It is mostly used when there is a suspicion of cancer in the cervix, or when there are suspected cancer cells in the cervical smear, or when there is a suspicion of specific inflammatory disease, such as cervical tuberculosis. Finally, if colposcopy is in doubt, the doctor will take a small amount of cervical tissue for biopsy under colposcopic localization of the suspected lesion, and the biopsy result will be the final conclusion of the cervical lesion.