Abstract:Banana soluble dietary fiber （SDF）was extracted and its structure properties were analyzed.Then banana SDF was applied to mice in order to investigate its laxative effects.Results showed that SDF particles were transparent roundness observed，while they showed some irregular shape clumps connected and unsmooth surfaces in scanning electron microscopy.SDF was possibly composed of five monosaccharides，rhamnose，galatcose，xylose，arabinose and glucose at least.Mice were treated with the dose at 1，2，4 g/kg bodyweight per day in our research.Results showed that banana SDF were able to control daily food intake and body weight increase in mice，and these capacities were positively related to SDF dose.SDF decreased the time of the first black dejecta ejection of mice.The SDF treated groups were able to accelerate the movement of small intestine.Consequently，banana SDF was not only benefit for constipation remission，but also benefit for reducing body weight growth.