The dietary fiber has many medical functions in treating illnesses like diabetes, intestines problems, obesity, cardiovascular diseases, gall-stone, cancer and constipation. However, when it comes to the treatment of diabetes, different dietary fiber of different sources and origins vary drastically in their alleviating effects. Soluble dietary fibers are of better effects in hypoglycemic activity than insoluble ones. The development of the dietary fiber resources, new preparatory methods, the expansion of its distinctive uses and physiological functions, research of commercial production and the economic value of exploration have now become research hotspots.%膳食纤维具有防治糖尿病、肠道疾病、肥胖症、心血管疾病、胆结石、癌症和便秘等作用．但对糖尿病，不同来源、不同性质的膳食纤维的缓解作用是有差别的，可溶性的膳食纤维降血糖的效果优于不溶性的膳食纤维．膳食纤维资源的开发、新的分离制备方法、独特的生理功能和用途的拓展、工业化生产的研究、开发利用的经济价值等方面是当前研究的热点．
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