Abstract: The maltodextrin was used as raw material and epoxy propane as etherification agent in this paper to prepare hydroxypropyl maltodextrin and the viscosity, retrogradation, freeze- thaw stability, hygroscopicity, transparency and stability of hydroxypropyl maltodextrin of different DE values were also studied. The orthogonal experiment showed that the optimum conditions of hydroxypropyl maltodextrin were indicated as follows:reaction temperature was 35℃ and reaction time was 18h, sodium hydroxide and propylene oxide dosage was respectively 10% (w/w) and 12% (v/w) . Compared hydroxypropyl modificated maltodextrin of different DE values with original maltodextrin, its viscosity and molecular weight were almost similar, retrogradation was decreased, freeze-thaw stability and hygroscopicity were increased, the transparency of hydroxypropyl maltdextrin of high DE value was lower than the original maltodextrin and transparent stability was similar while the transparency of low ones was higher than original and transparent stability was increased.