The radio frequency high-frequency electrosurgical knife outputs high-frequency electromagnetic waves through the working end of the high-frequency endoscopic surgical electrode (the electrode tip forms a self-closed loop), which is concentrated in a small area.

Since cells contain a large number of water molecules， which are polar molecules and are affected by electromagnetic field. Under the action of this local high-frequency electromagnetic field, water molecules oscillate rapidly and rub against each other, causing intracellular water evaporation, vaporization, cell rupture, opening molecular bonds, and decomposing tissues into carbohydrates and oxide, so as to achieve the purpose of ablation.