The utility model provides a frequency is fixed, has increased by 14 emblem positions in the inboard that main and collateral channels resonance musical instrument changes a social system on the basis of current seven -stringed plucked instrument in some ways similar to the zither and forms, more conventional seven -stringed plucked instrument in some ways similar to the zither linear expectation 13, and the frequency step down one time, every string for bring out the resonance at main and collateral channels acupuncture point, the treatment disease, the advantage is: the sound production frequency is low, is experienced by main and collateral channels more easily, 7 the string frequency is fixed, can correspond 14 main and collateral channels.