Cervical cancer is one of the common malignant tumors in women, with the second highest incidence rate among female malignant tumors. The total number of new cases of cervical cancer in China accounts for 28.8% of the world. In recent years, there has been a breakthrough in the research on the etiology of cervical cancer, and it has been established that human papiloma virus (HPV) infection is a necessary condition for the development of cervical cancer. However, cervical cancer and its precancerous lesions can be detected early and cured. Through regular Thinprep Cytologic Test (TCT) screening, early cervical cancer and precancerous lesions can be detected accurately and sensitively, and active treatment of early lesions can stop the disease process and prevent the occurrence of cervical cancer, especially infiltrative cancer. TCT examination is a descriptive diagnosis of cervical cells and TBS (The Bethesda System, TBS) cytology by using liquid-based thin-layer cell detection system, which is the most advanced cervical cancer cytology examination technique in the world. TCT liquid-based cervical cytology is convenient, non-invasive, painless and easy for patients to accept. It is convenient, painless and easy for patients to accept; it is also inexpensive and facilitates regular review; it is important for early detection of cervical cancer to carry out extensive screening by this method. The TBS classification of cervical cells was established in 1988 by a meeting of 50 cytopathologists in Washington, D.C., Bethesda, Maryland, and has since been refined through several revisions. This type of patient requires a 3-monthly review of TCT cytology; 2. Atypical squamous cell, high intraepithelial lesion (ASC-H): refers to a possible precancerous lesion, but the degree of cellular heterogeneity is not sufficient for a definitive diagnosis. LSIL): equivalent to histopathological CIN grade 1 (mild atypical hyperplasia), some suspicious precancerous cells are found, but not cancer cells, some of the disease at this stage will subside on its own, TCT cytology should be reviewed in 3 months or colposcopy should be performed; 4. High grade intraepithelial lesion (HSIL): equivalent to histopathological CIN grade 2-3 (moderate to severe atypical hyperplasia, carcinoma in situ), with carcinoma in situ), with suspected precancerous cells or pre-cancerous cells, if further definite diagnosis is not made and corresponding treatment is not taken, the possibility of developing into cancer is higher, and pathological histological biopsy should be taken in time; 5. squamous cell carcinoma (SCC). The brush tube with TCT can not only brush all the exfoliated cells of the whole cervical opening, but also the exfoliated cells of the cervical canal, thus, not only the abnormal cells of the squamous epithelium of the cervical opening, but also the abnormal cells of the glandular epithelium in the cervical canal can be found. Therefore, TCT cervical cytology is a more comprehensive and effective screening method for cervical cancer, which has long been proven by a large amount of data on cervical cancer screening at home and abroad. The procedure of cervical cancer screening should be: cervical cytology examination first, if no abnormal result is found, colposcopy and other examinations are not necessary, and of course, cervical biopsy is not necessary; if abnormal cells or suspicious cancer cells are found in cervical cytology examination, colposcopy should be performed, and small pieces of tissue should be taken from the suspicious lesions under the direct view of colposcope for pathological histological diagnosis. Therefore, cervical cytology examination is the first choice for screening cervical cancer and detecting early cervical lesions, while TCT combined with TBS descriptive classification diagnosis is one of the most advanced and scientific examination methods and means at home and abroad. Screening targets: women who have had sex at the age of 18 or above; women who have had sex for more than one year; women who have had sex too early (<16 years old); women who have given birth; women who take birth control pills regularly or irregularly; women who have a history of abortion; women who have occasional abnormal symptoms and have not sought medical attention; women who have more than two sexual partners; women who have abnormal leucorrhea, vulvar itching, lower abdominal pain, menstrual pain, weakness, and menstrual cramps. Women who have symptoms such as abnormal leucorrhea, vulva itching, lower abdominal pain, lower back pain, menstrual disorders, etc.; women who maintain a sexual life especially in their 30s; women who smoke; women who are suspected of having HPV infection. Early signs of cervical cancer: increased leucorrhea: there may be no abnormal smell at the beginning; abnormal leucorrhea: it may be mixed with blood and accompanied with foul smell; irregular vaginal bleeding: mostly seen in bleeding from sexual intercourse, bleeding from lower abdominal force, bleeding after menopause, etc.; cervical erosion: young women with cervical erosion for a long time or still have cervical erosion during menopause. All of the above subjects are necessary for cervical TCT cytology examination.