To discuss the optimum extraction of polysaccharides from Radix Scrophulariae. Methods: Orthogonal design was adopted to review the influence on the content of polysaccharides woked by the factors such as temperature,time,ph and the ratio of water and material and then confirmed the best extraction techniques. The determination of polysaeeharide was taken by phenol-sulfuric acid method. Result: The best technical conditions were as follows : Extraction time 50min, Extraction temperature is 50℃, Extraction pH = 8, the ratio of material and w...