Abstract: The β-cyclodextrin,water content,crystallization temperature and crystallization time on the digestibility and hydrolysis rate of wheat starch modified by β-cyclodextrin were studied. The results showed that the content of rapidly digestible starch( RDS) of wheat starch modified by β- cyclodextrin decreased, slowly digestible starch( SDS) increased and resistant starch( RS) increased first and then decreased with the increase of the amount of β-cyclodextrin.The optimum preparation conditions of slowly digestible starch mofied by β- cyclodextrin were as follows : the amount of β- cyclodextrin 3 %, water content 80 %, crystallization temperature 25 ℃,crystallization time 2 h. Hydrolysis kinetic experiments showed that the hydrolysis rate of wheat starch modified by β-cyclodextrin was less than the unmodified.