In this study,the activity of α-rhamnosidase and β-glycosidase in fermenting liguor were detected by HPLC,the effects of carbon source,pH value,agitation speed and fermentation temperature on yield of naringinase were investigated,the fermentation conditions of Aspergillus niger DB056 in liquid culture were optimized by 7 L fermentor and evaluated by the activities of naringinase,α-rhamnosidase and β-glycosidase.The results indicated that 20 g/L naringin was better than other two carbon sources(20 g/L gluco...