According to the regulations, minimally invasive mastectomy is a second level surgery, compared to the first level surgery such as mastectomy, its difficulty factor is relatively higher, this is because the doctor needs some time to learn before operating this surgery. The details are as follows: 1. Mastectomy, first of all, requires color ultrasound guidance, so it is necessary to have some basic skills in color ultrasound, to use color ultrasound to find lumps, especially those with unclear borders, but clinically considered malignant lesions, clinically specific lumps, so the color ultrasound skills must be mastered; 2. After the lump is removed, the ultrasound should be used to check whether the lump is completely removed. These are the skills that need to be mastered in ultrasound. 4. For the removal of multiple masses or masses in special locations, i.e., those superficial to the skin, certain skills are also needed.