Waxy corn starch crystallite was prepared with acid-alcohol hydrolysis.For different hydrolysis rate of starch crystallites,the properties such as granule morphology,X-ray diffraction pattern,DSC thermostability,solubility and digestibility were studied.As the degree of acid-alcohol hydrolysis increased,starch granules gradually became lamellae and finally debris;the amorphous areas of the starch were first hydrolyzed,then defective crystal areas was hydrolyzed,and breakdown;They were A-typed starch.Compared with native starch,Tp and Tc value of starch crystallites were all raised.the range of gelatinization temperature of treated starch crystallines became larger,and gel enthalpy with different hydrolysis rate were decreased and then increased.The solubility gradually increased with increasing hydrolysis rate of starch crystallites.In vitro,the digestion products and rates increased with increasing hydrolysis rate.The digestion rates were increased first and then decreased for the same hydrolysis rate of starch crystallit.