Cervical intraepithelial neoplasia grade I, referred to as CIN I, is a mild pre-cancerous lesion of the cervix, which can regress spontaneously in about 60% of young patients and rarely turns into cancer. 1. If the TCT report is a low-grade lesion and the colposcopic biopsy result is CIN I, treatment depends mainly on the combined symptoms. If there is combined intercourse bleeding, laser treatment can be performed. If there are no symptoms and only routine physical examination reveals them, they can be reviewed periodically, with TCT every 6 or 12 months, or HPV testing every 6 or 12 months. if the review is positive for HPV or other abnormalities, colposcopy will need to be done again. If HPV is negative, or if TCT is normal twice, screening can be done every 2 years. 2. If TCT reports high-grade lesions, but colposcopic biopsy results in CIN I, cervical conization is preferable. If there are no symptoms or the cervix is smooth, regular review can be done with TCT and colposcopy every 6 months for a time limit of 1 year. In regular review, if high grade lesions are found in the 6th or 12th month review, cervical conization is still needed.