As the condition of each ductal carcinoma in situ is different, the surgical methods that can be adopted for surgical treatment are also different. Total mastectomy is usually given to patients with more extensive lesions, while breast-conserving surgery can be considered for patients with more limited lesions. 1. Total mastectomy: It is suitable for patients with extensive lesions of ductal carcinoma in situ, especially for patients with multiple lesions, lesions with a range of 4~5cm and above, or patients with more than one quadrant, total mastectomy can remove the lesions completely as far as possible, and prevent recurrence after surgery. 2. Breast-conserving surgery: it is suitable for patients with relatively limited scope of lesions of ductal carcinoma in situ, which generally refers to patients with lesions less than 3cm in diameter and without multicenter lesions. The foci of this kind of patients are relatively limited, and the postoperative pathology confirms that the margins are negative, which means that breast conservation is successful. It is recommended that the patient go to the hospital, complete the auxiliary examination, in order to clarify the patient’s condition, and the professional physician will take appropriate treatment according to the condition.