Abstract: Choosing the residue of the citrus peel as experimental materials,the insoluble dietary fiber was distilled by microwave kill enzyme,decolorized,dried,grinded and centrifugal separation. The effect of residue dietary fiber productivity could be shown when studied the extraction temperature,time and ratio. At the same time,the optimum extraction process could be used to extract the IDF from the peel of small kumquats,oranges,gold-rimmed shaddocks and the ugly oranges,and to determine the physicochemical indicators and functional properties. The result showed that the optimum microwave extraction process of IDF was that when the extraction temperature was 40 ℃,the extraction time was 2 minutes,the extraction power was 400 W and the feed liquid ratio was 1:4 g/m L. In this condition,the extraction ratio of citrus IDF reached a maximum number,18.13%. And the moisture content in ugly orange peel residue IDF was up to 8.05%,the gold-rimmed shaddocks ash content was up to 4.70%. The small kumquat fat,the protein and the total sugar content were up to respectively4.36%,2455 μg/g,18.18%. The water retention property and the expansibility of the orange were highest,respectively was 949% and 1384%. The oil retention of the ugly orange could up to 189%.