In order to supply YIG filter with stable and reliable stimulating current, use DA transmission chip to transfer numerical signal into analog voltage signal, control constant current circuit to create YIG filter stimulating current signal. Based on ADUc812 single chip, design a YIG stimulator to control tune YIG ball resonance frequency through controlling output current. At the same time, use 12 bit parallel interface to communication, and adopt compensation mode based on hardware and software to temperature compensation. Use EEPROM in ADuc812 chip as compensation data memory. The result shows that the system running is stable and reliable and it is applied into project at present, and achieved marvelous economic effects.