Abstract: Apple pomace was used as raw material to extract soluble dietary fiber (SDF) and insoluble dietary fiber (IDF) with single factor experiments and orthogonal tests.SDF-A and SDF-B were prepared in this experiment.Results showed that the optimum conditions of SDF-A were as follows:with raw material 0.35mm diameter,3%hydrochloric acid,80℃,2.0h and liquid-to-solid ratio 15∶1(ml/g) .And the optimum conditions of SDF-B were as follows:with 8%sodium hydroxide,90℃,3.0h and liquid-to-solid ratio 8∶1(ml/g).

Key words: apple pomace, dietary fiber, technological condition