Breast cancer T3N0M0 is classified as intermediate stage. According to the pathological staging of breast cancer, T3 means that the tumor is larger than 5cm, NO means that there is no enlarged lymph node in the ipsilateral axilla, and MO suggests that there is no clinical or imaging evidence of distant metastasis, therefore, T3N0M0 belongs to the intermediate stage of breast cancer, and its clinical staging is stage IIB. Patients with mid-stage breast cancer need to formulate timely treatment methods according to the patient’s physical condition, tumor size, etc. Generally, it is necessary to adopt the principle of comprehensive treatment, and jointly use a variety of therapeutic means, such as surgical treatment, chemotherapy, radiation therapy, etc. Her-2 positive patients also need to receive targeted therapy. Although breast cancer T3N0M0 belongs to the middle stage, after active treatment, to a certain extent, it can inhibit the spread of cancer cells, prevent the disease from progressing, and improve the survival rate and survival time. It is recommended that patients keep an optimistic and positive mindset and undergo regular treatment as early as possible.