Soluble dietary fiber (SDF) is one of the important nutrients in apple, which has a variety of wholesome function to human body and great potential for development in the food and other industries. The composition, properties, biological activity and extraction of SDF, pectin and polydextrose in apple pomace, and the advantages and disadvantages of the technology were discussed. The research progress in the methods of decolorization and modification of SDF in apple pomace was summarized. The application and process development of the apple SDF were prospected.