Abstract: To obtain new wall material used in oil microcapsule, the modified dextrin was prepared firstly by the cross-linking cassava dextrin with sodium trimetaphosphate as the sodium trimetaphosphate agent, and then esterified with octenyl succinic anhydride.The properties and application of cross-linked and OSA cassava dextrin was studied.The results showed that the modified dextrin had a lower viscosity and fine emulsification.The synthesized dextrin esters used as wall material in microcapsulation with an embedding ratio of 94%, which the content of surface oil was low.The reconstituted emulsion of microcapsule displayed a narrow particle size distribution spectrum.Microcapsule particles were spherical, smooth, morphological uniformity.