There is a big difference between knowing how to do surgery and doing it well. I always tell my subordinate physicians that one of the important criteria is the implementation of the tumor-free concept in cancer surgery. When explaining the condition to the patient’s family, some people are very prejudiced that malignant tumor should not be treated, the more treatment the faster death. My answer is: according to this way of thinking, all the cancer hospitals in China are harmful places and should be closed down? Therefore, surgeons without the concept of tumor-free cannot do tumor surgery, otherwise you are intentionally or unintentionally seeking money and killing people. We know: surgery for malignant tumor is divided into: radical surgery; surgery with comprehensive treatment (tumor biopsy); palliative surgery (surgery to reduce pain such as simple fistula surgery); and tumor reduction surgery (surgery to remove only part of the tumor). What is the tumor-free concept? Based on our work experience, we believe that in order to ensure the efficacy of radical tumor surgery, the tumor-free concept should have the following aspects: (1) The part that may be contaminated by the tumor must be removed during the surgery, such as the soft tissue of the last surgical approach must be removed during the second surgery. (2) The operation should be gentle and avoid squeezing the tumor, especially the tumor which is easy to metastasize along the blood, of course, this will increase the difficulty of the operation. (3) The tumor must be removed in large pieces along the safe margin of the normal tissues around the tumor, and avoid entering the tumor inside. (4) Do the place where there may be tumor first, and then do the place where there is definitely tumor. That is to say, do the metastasis first and then do the primary site. (5) If the surgery involves functional reconstruction and taking normal tissues, gloves and all surgical instruments must be changed. (6) Try to cut off the possible metastatic pathways first during surgery. For example, neck surgery is best performed from the bottom up because blood and lymphatic fluid in the neck flow from top to bottom. (7) Try to increase sharp separation and decrease blunt separation. (8) Use the electric knife as much as possible if the conditions (to ensure the safety and efficacy of the operation) allow. (9) Use distilled water or distilled water containing antitumor drugs for postoperative flushing of the operative cavity. (10) Tumor reduction requires final severance of the connection with the residual tumor. (11) The vein should be cut and tied before the tumor is removed during the operation. (12) No contact with the tumor during surgery, if the tumor is exposed, tumor isolation measures should be given first, such as covering the surface of the tumor with dry gauze sutures to prevent implantation. (13) For highly malignant tumors, the concept of comprehensive treatment with preoperative chemotherapy is emphasized. (14) For surgery that does not remove the whole organ, disconnection from the residual normal part of the union should be started after the treatment of the veins and vessels. The above is just a summary of work experience, and I am very glad to have the criticism and correction from colleagues.