Before breast cancer in situ surgery, it is necessary to prepare for good dietary adjustment, physical examination and a good state of mind. 1. Dietary adjustments, breast cancer in situ patients need to eat as much liquid food as possible before surgery to reduce the burden of intestines and defecation, and try not to eat anything 12 hours before surgery, and don’t drink water 6 hours before surgery, so that the intestines can be emptied. 2. Physical examination, before the operation, you need to do a good job of blood routine, liver, kidney and other organs, if you need to carry out axillary lymph node clearance, you also need to shave the armpit hair. 3. Good state of mind, patients need to keep their own good heartbeat, do not be too nervous, and more communication with the doctor, have any questions can consult the doctor.