Abstract:The optimal extraction technology of total saponins from black bean was studied in the paper.The total saponins was determined by ultraviolet spectrophotometry.The effects of ethanol concentration，extraction time，liquid-to-material ratio，extraction times and water bath temperature on the extraction rate of total saponins were investigated through single-factor experiments.The optimal extraction condition was optimized by response surface methodology.Ultimately，the results were as follows：the ethanol concentration 70%，liquidto-material ratio 9∶1（mL/g），extraction 2 times，extraction time 1 h，water bath temperature 85℃.In this condition，the extraction rate of total saponins was 3.33%.The extraction technology of total saponins from black bean which was optimized through response surface methodology was in high credibility and good predictability.