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Through the single factor and orthogonal test of adding, amylase and papain efect of soluble dietary fiber on the extraction of sweet potato stem and leaf, and orthogonal optimization of extraction process on the basis of single factor were studied The optimum condition of enzymatic extraction were as folows: adding amount of lipase was 0.015 g.100 mLG-, adding amount of amylase was 0.035g.100 mLG-1, and adding papain 0.075g .100 mLG -11including the impact of orthogonal experiment factors for amylase> protease > lipase The best extraction rate of waterG soluble dietary fiber was 1.285% The extraction of sweet potato leaves and stems of soluble dietary fiber in high purity,water holding capacity was 787%,the sweling force was 4.10 mL .gG-1,the product had good quality [ABSTRACT FROM AUTHOR]