High temperatures do kill cancer cells, and cancer tissue cells are more intolerant to high temperatures, compared to normal cells. When the temperature is consistently above 42.5°C, it can kill most tumor cells. However, it is not a particularly suitable and effective treatment method, because many normal tissue cells are also difficult to tolerate under continuous high temperature, such as many neuronal cells in the brain, which tend to undergo necrosis if they are exposed to about 42.5℃ environment for a long time. Therefore, tumor heat therapy is still being researched, but using whole body heat therapy is not too much done at present. This is because the side effects may be relatively large and may lead to unexpected death of the patient. Nowadays, the main use of heat therapy is to carry out abdominal thermal perfusion treatment or thoracic thermal perfusion treatment, that is, using high temperature together with chemotherapy drugs to form a relatively high degree of heat locally, together with chemotherapy drugs to make tumor cells die more easily, while the overall human normal tissue temperature will not be particularly elevated, thus improving the efficacy.