Due to the extensive resection of radical breast cancer, if functional exercise is not performed in time after surgery, it will cause dysfunction of the affected upper limb, which will affect the life and work of patients. Early functional exercise is beneficial to the venous reflux of the upper limb after surgery, reduce the occurrence of scar contracture, enhance patients’ confidence in life, and improve the quality of life. Functional exercise steps for the affected limb: 1.1～3 d after surgery (bedside phase): practice finger extension, fist clenching and wrist flexion. 2.3～5 d after surgery (negative pressure suction removal): practice sitting elbow flexion movement. 3.5～8 d after surgery (chest belt release): practice touching the contralateral shoulder and ipsilateral ear with your hand. 4.9～13 d after surgery: practice straightening, elevation, inversion and flexion of the upper limb on the affected side, and lift the shoulder joint to 90° to reach the level of flat shoulder. 5.14 d after surgery: practice shoulder joint, put both hands behind the neck, practice from low head position to head up and chest position, then practice hand over the top of the head to touch the opposite ear; start to practice hand-held wall lift on the operated side until the appraisal before discharge. 6.Post-hospital: Continue to practice wall elevation and gradually take the shoulder joint as the center to do forward and backward rotational movement and appropriate posterior extension and weight-bearing exercise. Small note: Exercise should not only prevent the movement from being too large and violent to affect the wound healing, but also note that the movement should not be too small to avoid affecting the training effect. It is best to design a schedule, record the daily exercise, and gradually increase the exercise action and activity.