In order to improve the furfural solubility and selectivity in extracting furfural extract oil，single extraction in laboratory experiments was done by choosing ultrasonic method.The effect of ultrasonic frequency, intensity, reaction time and the way of the ultrasonic on yield and characteristic of the refined oil were mainly studied. The results show that the yield of refined oil significantly increased by 2%~3% , there is not obvious changes in basic properties of the refined oil but quality obviously improved with auxiliary assist of the ultrasound radiation when the operating temperature is 60 ℃.