The extraction of dietary fiber in pomelo peel from Pinghe county,Fujian Province was studied.The orthogonal test,based on the extraction rate and the 3:1 ratio of IDF/SDF was designed to determine the best extracting condition on NaOH concentration,extracting temperature and extracting time.The results indicated that,the best extracting conditions of total dietary fiber(DF) from pomelo peel were :NaOH concentration was 8%,extracting temperature was 90℃ and extracting time was 90 min.Under the above conditions,the extraction rate was 75.12% and the ratio of IDF/SDF was 2.12.The size of TDF from 0-120 mesh was 30.13%,followed by 120-140 mesh(21.84%).Fine water holding capacity in IDF was 17.642 0 g/g.However,the best expansibility was SDF(5.711 5 g/g).The data showed that significant absorbed capacity of DF on NO2-was under pH 2 and pH 7.The capacity that DF absorbed NO2-increased while the time increased,and pH 2 was better than pH 7.The capacity that DF absorbed unsaturated fatty acids was better than saturated fatty.This suggested the DF adsorption on animal lipid was superior.