Before radiotherapy for breast cancer, patients should pay attention to the functional exercise of upper limbs on the affected side, and at the same time maintain regular work and rest to promote the recovery of the operation area. 1. Pay attention to the functional exercise of upper limbs on the affected side: breast cancer patients need to stretch their arms upward during radiotherapy, therefore, they should carry out functional exercise of upper limbs under the guidance of doctors, so that the function of upper limbs can meet the requirements of radiotherapy. 2. Maintain regular work and rest: breast cancer patients should maintain regular sleep before radiotherapy, avoid staying up late, and keep a happy mood to get ready for radiotherapy. 3. Preparation of operation area: the requirements of radiotherapy on chest wall are no accumulation of gas and fluid under the skin and healing of incision, patients should actively cooperate with doctors to speed up the recovery of operation area in order to meet the requirements of radiotherapy. If breast cancer patients need radiotherapy, they should go to the hospital in time, follow the doctor’s instruction and standardize the treatment under the doctor’s guidance.