Abstract: The study was researched about ultrasonic extraction process of flavones from Xanthoceras sorbifolia Bunge leaf. The content of flavones in Xanthoceras sorbifolia Bunge leaf was determined by four factors including ethanol volume ,solid -to -liquid ratio ,extraction tempreture ,extraction time and ultrasonic power. Based on the single factor,the study determined the optimal process conditions by response surface experiments. The results showed that the optimal process conditions were percent of ethanol volume 60% , solid-to-liquid ratio 1∶10(g/mL),extraction tempreture 65℃ ,extraction time 31min and ultrasonic power as 70Hz. Under these conditions,the flavones extracted from Xanthoceras sorbifolia Bunge leaf yields was 4.06%.