Abstract: The rheological properties of corn starch dissolved in the ionic liquid 1- octyl- 3- methylimidazolium chloride( OMIMCl) were investigated by a dynamic rheometer.The results showed that starch- OMIMCl mixtures which contained4%,6%,8%( w / w) corn starch were non- newtonian pseudoplastic fluids. While,the fluid type of 2% corn starch- OMIMCl mixtures varied with temperature.The corn starch swelled in ionic liquid in the same way as in aqueous solution. The apparent viscosity of samples were decreased with the increasing of temperature,and increased with the increasing of starch concentration.Rheological properties of the mixture were well described by Arrhenius model( R~2> 0.9942).All the corn starchOMIMCl mixtures exhibited shear- thinning behavior in varying degrees,under the experimental conditions.And the greater the concentration of starch was,the more obvious of shear thinning behavior.