Without HPV infection 99% of people do not get cervical cancer. The main cause of cervical cancer is now well known and is HPV infection. If no HPV infection is seen when doing cervical pre-cancer screening, there will be no cervical precancerous lesions and no development of cervical cancer. However, for cervical pre-cancer screening, both HPV test and TCT test are needed. Because HPV test alone will be inaccurate in about 10% of cases, that is, there is a possibility of false positive or false negative performance. Therefore, it is necessary to combine TCT test at the same time to achieve a higher accuracy rate, which can reach 99%. Therefore, pre-cancer screening is two kinds of screening, and if there is no problem with these two kinds of screening, it can be reviewed once in 3-5 years.