[Objective] To optimize the extraction conditions of polysaccharide from Ipomoea batatas(Linn.) Lam.[Method] Polysaccharide from Ipomoea batatas(Linn.) Lam.was extracted by ultrasonic technology,and the extraction conditions were optimized by orthogonal test combined with single factor test.[Result] The influencing order of each factor on yield of polysaccharide was determined to be ultrasonic frequency >solid to liquid ratio> extraction temperature >extraction duration.The optimum conditions for extracting...