The first concept we need to establish is that, in view of the different degrees of lesions and the patient’s age and fertility requirements, different approaches should be taken to the treatment of CIN at all levels. The next treatment principles that should be mastered are. 1, CIN Ⅰ: if there is no high-risk HPV infection can be treated as chronic cervicitis, every 3 to 6 months until completely normal, if there is also high-risk HPV infection, you must perform cervical conization surgery or physical therapy and regular follow-up. 2.CIN II: Cervical conization or physical therapy should be used, with postoperative review every 3-6 months. 3, CIN III: For young women with fertility requirements, cervical LEEP is feasible. If the lesion is large, cervical conization can also be performed, followed up every 3 months after surgery until the cytology and HPV results are negative three times in a row, then reviewed every six months. For women without reproductive requirements and with other gynecological diseases such as fibroids, total hysterectomy is feasible. There are two types of treatment methods for CIN, one is physical therapy, including electric ironing, freezing, laser, etc., which is generally not too uncomfortable, convenient, and has few complications, and the basic principle is to clearly exclude invasive cancer before treatment. One type of treatment is surgery. Cervical conization for CIN is as simple and effective as antacids for gastritis, and the best part is that it has both diagnostic and therapeutic functions. Cutting down the complete specimen means that a complete and detailed pathological examination can be performed to further clarify the diagnosis, so that you can put your fears back in peace. There are two types of surgery, cold knife conization and LEEP knife. You should be reminded that regardless of the method used, the most and treated patients with CIN need long-term follow-up. Total hysterectomy is suitable for patients without voice and requirements to achieve radical results, but it is a larger and more painful operation with more complications. Background knowledge: cervical conization: cervical conization is the cone excision of cervical tissue and cervical canal using the ectocervix part as the cone base. The extent of cervical conization should depend on the size and involvement of the lesion, but must include a certain range of normal tissue around the lesion to prevent incomplete surgery. Traditional conization, i.e. cold knife conization, or scalpel resection, is the most classic procedure. In addition, in recent years, high-frequency electric knife conization, i.e. LEEP knife conization, has been widely welcomed because of easy operation and less complications such as bleeding and infection, but the method has a certain degree of destruction of tissue specimens and is not conducive to postoperative pathological examination, so it is recommended that for patients with large lesions and unclear exposure, cold knife conization should be chosen.