Abstract:In recent years，with the improvement of people′s health awareness，the soluble dietary fiber has been paid more and more attention because of its good processing performance and excellent functional characteristics.This paper summarizes five kinds of soluble dietary fiber extraction methods′advantages and disadvantages，such as the chemical method，the physical method，enzymatic hydrolysis，fermentation，and the joint method.And the functional characteristics of soluble dietary fiber and its application in food were summarized，which provided a theoretical basis for the development and industrialization of soluble dietary fiber.