HPV (high-risk type) is the cause of cervical cancer, but it takes a long time to develop into cervical cancer, cervical cytology can be done regularly, if there is no abnormal cervical cytology, it can be observed temporarily, HPV infection can be cleared by immunization, if abnormal cervical cytology is found, colposcopy should be done for early diagnosis of cervical precancerous lesions, colposcopy commonly uses acetic acid test and iodine test to show cervical and vaginal HPV The most likely site of HPV infection is the cervical squamous epithelial junction. Clinically, after CIN conization, HPV turns negative after about 6 months, but if it is still positive, it is possible that CIN remains. Since the gland can be as deep as 7 mm, lesions with CIN involving the gland are not easily excised.