With the development and promotion of breast cancer screening, more and more breast cancer patients can be detected in the early stage of the disease. Since the 1970s, breast-conserving surgery has become a routine procedure for early-stage breast cancer, and whole-breast radiotherapy after surgery is an important guarantee that breast-conserving surgery can be performed successfully. The results of the study found that the local recurrence rate after breast-conserving surgery + whole breast radiotherapy for early-stage breast cancer is comparable to that of total mastectomy, and the cosmetic results are satisfactory with minimal toxic effects and minimal impact on patients’ long-term quality of life, therefore, whole breast radiotherapy has been regarded as an important part of breast-conserving treatment. However, whole breast radiotherapy also has its inherent drawbacks: it takes a long time to complete radiotherapy, usually 5-6 weeks; it causes inconvenience to patients and their families due to the long treatment time and may increase the financial burden of patients; the whole breast is irradiated with a large dose, which may produce long-term therapeutic toxicity to the breast. So, is there a more convenient and faster radiotherapy technique than whole breast radiotherapy with comparable efficacy? Numerous studies have found that radiotherapy to the surgical site makes the greatest contribution to reducing the risk of local recurrence; 65-100% of recurrences after treatment of early-stage breast cancer occur in the same quadrant as the surgical site; only 3.6% of patients develop distant metastases, compared to a much higher risk of local recurrence than distant metastases. These findings have made partial breast radiotherapy possible. In recent years, a series of studies on accelerated partial breast radiotherapy for early-stage breast cancer have been carried out at home and abroad, and the results showed that this technique can replace whole breast radiotherapy for some patients with early-stage breast cancer. (2) radiotherapy can be completed within 4-5 days, compared to 5-6 weeks for conventional whole breast radiotherapy, which is a great convenience to patients; (3) due to the shortened treatment time, it is possible to save patients’ treatment costs. Partial breast accelerated radiotherapy can be achieved in a variety of ways. Commonly used techniques include inter-tissue brachytherapy (catheter technique, Mammosite system), intraoperative radiotherapy, external irradiation, etc. The technique of partial breast external irradiation for early breast cancer has been carried out in the radiotherapy ward of our Clinical Oncology Center. This technique is the only non-invasive operation among all partial breast radiotherapy techniques currently available. It has the potential to achieve better cosmetic results due to better dose uniformity within the target area compared to brachytherapy, and in addition, no additional surgical accompaniment is required during the implementation of this technique, thus potentially reducing complications and lowering treatment costs. Currently, partial breast radiotherapy is not suitable for all patients with early-stage breast cancer. The implementation of this technique has strict requirements for patient selection, including patient age, BRAC1/2 mutation status, primary tumor size, T and N stages, pathological type, surgical margins, and whether induction chemotherapy is administered. Please consult with your radiotherapist and surgeon in advance before deciding whether you are a candidate for this technique.