Real time temperature compensation (detection and compensation in 1s) is carried out. Two electrodes and cannula of the same type are used at the same time. The bipolar space is not more than 5 times of the diameter of the RF trocar. 5x20 = 0.175in = 0.45cm 5x21 = 0.16in = 0.41cm in the four pin continuous RF damage area, the RF output power value of four pole continuous RF mode is the sum of the output power of all electrodes The four pole continuous RF mode host can display and monitor the treatment temperature of four groups of electrode needles at the same time, and the host computer can display the heating chart of four groups of electrode needles at the same time