[Objective]The research aimed to study the ultrasonic extraction technology of total flavonoids from Cirsium japonicum DC.and optimize its extraction process.[Method]The effects of ethanol concentration,extraction time,extraction temperature,and the material-liquid ratio on the extraction of total flavonoids from C.japonicum were studied by using ultrasonic extraction technology.The best extraction conditions for flavonoids extraction were confirmed by using orthogonal experiment and single factor test.[Res...