The development of cervical cancer is a long-term process, and if screening can be performed at the early stage of the lesion, the occurrence and development of cancer can be prevented. The focus of cervical cancer screening is to detect precancerous lesions during the period when there are no conscious symptoms and to provide early clinical diagnosis and treatment in the non-cancerous stage so as to prevent and stop the occurrence of cancer. For those who have never been screened, those whose previous screening information is unknown, and those whose previous screening results are unreliable, screening can be performed about 3 years after sexual intercourse. The vast majority of cervical cancers are due to hpv infection mostly. If the resistance is good, hpv can be cleared, and a few persistent hpv infections will develop cervical precancerous lesions, and additional hpv screening can be done over 30 years old.