Abstract:The influence of ultrasound assisted enzyme method and additive agents on the yields，structure and properties of resistant starch（RS3）was discussed.Resistant starch was synthesized by ultrasound assisted enzyme method.Effects such as ultrosound time，enzyme amount，kinds and amount of the additives were tested.Characters were tested by SEM，DSC，IR and XRD；then properties such as luminousness and water-holding capacity were tested.The results showed under the condition of ultrosound time 10 minutes，the amount of α-amylase 10 U/g，the amount of sodium alginate 2%of the amount of starch，the yield of RS3was 11.92%.The SEM results indicated，comparing with the native maize starch，surface morphology and crystallinity of RS3both changed，with sphere-like particles turning into large sheet with wrinkles and crystal of type A turning into Type B.The properties test results indicated water content and transmittance declined，specific volume lowered，and the emulsibility increased.The structure of RS3was closer，and the properties of heat resistance and enzyme resistant was higher.It may be a reference in investigating the method of raising the yield of maize resistant starch and of broadening the using of RS3in food industry.