CIN is the abbreviation for cervical intraepithelial neoplasia, which is a precancerous disease associated with cervical cancer s cut.7 (5) Women aged 25-35, CIN has two outcomes: one is the natural regression of the lesion, which rarely develops into cervical cancer; the other may develop into cervical cancer. 2. CIN I: about 60-85% will regress naturally. If the biopsy is CIN I, cytology or HPV-DNA should be rechecked every 6 months for observation. Cryotherapy or laser treatment is available. 3.CIN II: 20% of CIN II will develop into carcinoma in situ and 5% will develop into invasive carcinoma. Therefore, Loop Electric Excision of the Cervix (LEEP) should be used. The results of histopathological examination should be removed and then treated as appropriate. 4.CIN III: i.e. carcinoma in situ, for those who are young and need to have children, LEEP can be performed. Those who are older and do not require childbirth can undergo total hysterectomy. 5.CIN during pregnancy can be observed, but it needs to be treated after postpartum review as appropriate.