All the SDFs of citrus fruit peels exhibited a near-Newtonian fluid behavior, and grapefruit SDF solution had higher viscosity than that of others. The main monosaccharide of orange SDF was glucose (33.87%), while arabinose was the main monosaccharide in the SDFs from grapefruit, lemon, gonggan and ponkan (38.67– 44.83%). To the water-holding, oil-holding and swelling capacities of insoluble dietary fiber (IDF), the IDF from grapefruit and orange were the highest and lowest one respectively