Abstract: The flavonoids from the castor bean meal were extracted by ethanol extraction technology. On the basis of single factor experiment,through the orthogonal test,the extraction conditions of total flavonoids from castor bean meal were optimized. The best optimal technological conditions for extraction of total flavonoids from castor were as follows : ethanol concentration was 70 %, the ratio of solid to liquid was 1 ∶ 25( g / m L),extracting temperature was 75℃ and extracting duration was 3h,then the extraction ratio of total flavonoids was2.50%,converted to the content of 25.03mg/g. Under this condition,the extraction rate of flavonoids was higher,two consecutive extraction ratio could reach 96.01%. The extraction method was simple,which had a certain application value for industrialized production of total flavonoids of castor bean meal.