Abstract: In order to research the medical value of exocarpium and develop the naringin products,this article researches the ultrasonic-assisted ethyl alcohol extracting technology of naringin in the exocarpium via the single factor expriment and response surface optimization. The results showed that the best extracting technological parameters of naringin in exocarpium were as follows. The extracting temperature was 57.5℃,liquid to solid ratio was 60.9 (mL:g^-1),the volum fractor of ethyl alcohol was 50.8%. The actual extracting rate of naringin in exocarpium was 7.87%,which was close to the predicted value(7.95%)of response surface. So the ultrasonic-assisted ethyl alcohol extracting technology of naringin by response surface optimization was genuine and believable. The ultrasonic-assisted extracting efficiency was high.