Abstract:The best technological way of extract flavonoids was determined by examining the impact of ethanol concentration，temperature，ratio of material to liquid and extraction time on extraction rate of flavonoids.By using single factor test and orthogonal test，this research indentified that the optimal process conditions of ultrasonic method to extract flavonoids in tartary buckwheat were as follows：ethanol concentration was 70 %，ratio of material to liquid was 1 ∶70（g/mL），temperature was 80 ℃ and extraction time was 50 min.Under such process conditions，extraction rate of flavonoids was 4.128 %.The optimal process conditions of constant temperature water bath method to extract flavonoids in tartary buckwheat were as follows：ethanol concentration was 80%，ratio of material to liquid was 1 ∶70（g/mL），temperature was 70 ℃ and extraction time was 80 min.Under such process conditions，extraction rate of flavonoids was 4.477%.By comparing the two methods，it was found that the content of flavonoids extracted by the two methods had little difference，the extraction time by ultrasonic method was relatively short，energy saving were found.Therefore，the effect of ultrasonic-assisted extraction of flavonoids from tartary buckwheat wheat rice was better than that of constant temperature water bath method.