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A new music doctor with digital music source is designed in view of the shortcoming of traditional musical doctor such as low tone quality and serious distortion. The hardware of the digital music electrotherapy instrument consists of three parts: music source control system, music signal adjusting module and therapeutic signal monitoring system. With pre-amplifier and power magnification the signal is adjusted. The digital music source is designed based on MCU C51 with MP3 decoder, audio file storage system based on USB interface with FLASH memory. At last the functions of data saving and display are realized by monitoring system. The experimental results show the fine cadence consistency between remedial signal and music signal.