1、The core circuit of the instrument is controlled by microcomputer, which consists of host, output cable and electrodes, with two independent outputs, each of which can freely select the frequency, timing time, output current and output polarity (DC or AC). 2, DC output: for intermediate frequency equal amplitude sine wave after rectification of pulsating DC, known as unidirectional output of the audio current, the two DC can be carried out separately for two patients DC therapy or DC drug (ion) introduction therapy. AC output: medium-frequency equal-amplitude sine wave (audio), two-way current can be given to two patients for audio therapy or medium-frequency drug penetration test. 3, for intermediate frequency drug penetration test, can be soaked in liquid on the fleece set in one or two conductive electrode sheet, fixed in the treatment site with a strap, or the liquid can be evenly sprinkled in the area and the fleece set similar gauze, flannel or filter paper, placed on the patient's treatment site, and then placed on the set of wet fleece set of the two conductive electrode sheet, fixed with a strap. 4, solid-frequency interference output: AC output in two independent sinusoidal output current at the same frequency with a small fixed difference frequency (16Hz, 32Hz, 64Hz), resulting in static interference current, the two electrodes can be placed cross-frequency interference therapy on a patient. When carrying out fixed frequency interference therapy, the A and B electrodes should be placed crosswise on the diseased part of the human body. And the frequency of A and B should be adjusted to the same frequency. The two output currents must be adjusted synchronously, and as far as possible, the two output currents should be slowly increased to the required dose at the same time. 5, on the knee osteoarthritis, cervical spondylosis caused by pain has a certain therapeutic effect, and has a direct current drug introduction function.