Objective To explore the optimal method for ultrasonic extraction of flavonoids from Radix Astragali leaf tea.Meth-ods Using ultrasound assisted extraction method combined with single factor experiment and orthogonal experiment,the optimal ex-traction process for flavonoids in Hengshan Radix Astragali leaf tea was determined.Result The factors were ranked as follows:ma-terial-liquid ratio>ethanol concentration>ultrasonic power>extraction temperature>extraction time;The optimal extraction pro-cess was as follows:the material-liquid ratio was 1∶35 g/mL,the ethanol concentration was 60%,the ultrasonic power was 280 W,the extraction temperature was 60℃,and the extraction time was 45 min.Conclusion Under these optimal conditions,the extrac-tion rate of total flavonoids in Hengshan Radix Astragali leaf tea was 14.302%.
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