Hot water extraction technology of jujube dates polysaccharides (JDP) were optimized by orthogonal method. Using the methods of ethanol step and stepwise precipitation, molecular weight distribution of JDP were studied. Result showed that the optimal process condition for extracting JDP by hot water was 1:15 of Zizyphus Jujuba Mill to water at 100 ℃ for 6h and two times. When ethanol concentration was below 80 %, the polysaccharides extracting rate and the ethanol concentration showed exponential correlatio...