Abstract: The sodium octenyl succinate anhydride modified starch was used as raw material to prepare high-charged-ion octenyl succinic anhydride modified starch (strontium,calcium and trivalent iron),and the microcapsule was produced by spray drying method using high-charged-ion-octenyl succinic anhydride modified starch and lemon oil as shell material and core material respectively. The ion exchange rate of high-charged-ion octenyl succinic anhydride modified starch,viscosity and stability of emulsion were determined. The effect of shell material on encapsulation efficiency was investigated,the morphology of microcapsules was observed by scanning electron microscope. The results indicated that the changes in ion valence had a significant effect on emulsion viscosity,emulsion stability,and embedding rate of lemon oil,the emulsion viscosity was 1.04 mPa·s and 96.51% lemon oil was encapsulated when Fe³⁺-OSAS was served as shell material. SEM analysis showed that the microcapsules prepared from Fe³⁺-OSAS had the largest particle size and the thickest wall. All the results indicated that Fe³⁺-OSAS could be used as a kind of favorable microcapsule shell material.