Abstract: In this research,OS-β- CD was prepared by esterifying β- cyclodextrin with octenyl succinic anhydride( OSA) with aqueous method,and the properties of OS-β-CD were characterized by FT-IR and XRD.Then,OS-β- CD and β- CD stabilized O / W emulsions were prepared with corn germ oil respectively.The particle size,polydispersity index and rheological properties of the emulsions had been studied. IR spectral analysis revealed that the C = O and C = C vibration absorption peaks appeared at 1725 cm~(-1) and 1574 cm~(-1) respectively. X- ray diffraction showed that the diffraction peak intensity of OS-β- CD was reduced when compared with that of β- CD,but the diffraction peak position remained the same,which indicated that the crystal structure of β- CD had not changed after OSA modification.The particle size,polydispersity index and zeta potential of OS-β- CD and β- CD stabilized emulsions were 175 nm,0.20,- 38.3 m V and 4962 nm,0.36,- 23.1 m V,respectively.A shear thinning behavior was observed for both emulsions when shear rate was between 0.1 s~(-1) and 70 s~(-1),and the viscosity of OS-β- CD and β- CD stabilized emulsions were 9.08 Pa·s and 4.38 Pa·s when shear rate was 0.1 s~(-1).The emulsion creaming index of OS- β- CD decreased when compared with β- CD. OS- β- CD could also act as a new emulsifiers,forming a stable emulsion with corn oil.