To answer such a question need to first understand the treatment principle of both: radio frequency is a frequency of 150,000 times the high frequency vibration. The human body is a complex structure composed of many organic and inorganic substances, body fluids contain a large number of dielectric, such as ions, water, colloidal particles, etc., the human body mainly relies on the movement of ions to conduct current. Under the action of high-frequency current, the direction of ion concentration changes with the direction of the current for positive and negative half round-trip changes. In the high-frequency oscillation between the two electrodes ions along the power line direction of rapid movement, from the mobile state into a vibrational state. Due to the different size, mass, charge and movement speed of various ions, the ions rub against each other and collide with other particles to produce bio-thermal effect. Due to the poor heat dissipation of tumor, the temperature of tumor tissue is higher than its adjacent normal tissue, and cancer cells are sensitive to high heat, so high heat kills cancer cells with minimal side effects. The temperature of local tissues can be increased to 70℃–95℃. Microwave heat mechanism: a large amount of water in human tissues or tumor tissues, under the condition of microwave field, many ions inside produce rotation and oscillation, such movement and friction of ions produce heat energy, and the temperature of local tissues can be increased to 65℃ – 100℃. The above shows that both are heat producing to kill tumor, also commonly known as heat therapy. But there is a point, radiofrequency thermotherapy developed early, multi-electrode area can form a nearly circular coagulation zone, not as twisted as the development of microblogging, because the microwave earlier rod temperature problem can not be solved, the tip of the needle can not form a nearly circular coagulation area, the temperature of the needle rod quickly rise, resulting in abdominal wall burns, and then our scientists used cold circulation to solve the rod temperature problem, microwave duration to extend the tip of the needle can form a nearly circular coagulation zone. Nearly circular coagulation area. Tumor cells are less tolerant to heat than normal cells, local heating to 39 ℃ – 40 ℃ can cause cancer cells to stop dividing (growth), 41 ℃ – 42 ℃ can cause cancer cell death or cause DNA damage, 49 ℃ or more can occur irreversible cell damage. Local high temperature can reach 70℃–95℃, the tumor tissue and surrounding organ parenchyma undergo coagulation necrosis, and a large spherical coagulation necrosis zone is produced during treatment, beyond the coagulation necrosis zone there is a 43℃–60℃ heat therapy zone, in which cancer cells can be killed and normal cells can be recovered. To sum up the above, we can see that RF and microwave are both thermal therapy for tumor treatment. Since microwave needle adopts cold circulation method, single needle form also produces spherical coagulation zone locally, which has the same effect as RF, and this conclusion has been recognized by the medical profession. Radiofrequency and microwave therapy for liver cancer are minimally invasive needle therapy, which is less painful, reliable and widely applicable, and is an important treatment measure for liver cancer.