Abstract: This wet process involves homemade chestnut starch as a raw material,hydrogen peroxide as an oxidant,and copper sulphate as a catalyst.In this study,the optimized conditions for oxidized chestnut starch and its physicochemical and structural properties were investigated. The results showed that the optimum preparation conditions were as follows: p H6,hydrogen peroxide∶ chestnut starch = 1∶ 1( V / W),copper sulfate amount was 0.03% of the dry starch and time for 8 h.Under the optimum process conditions,carboxyl content reached the highest degree of 53.79%.As the carboxyl content increased from 26.99% to53.79%,light transmittance research showed that transparency improved from 89.34% to 91.05%,however,the retrogradation was reduced by the oxidation at the same time. The SEM indicated that the surface of chestnut starch granules turned into rough,and exhibited different degrees of cracks,corrosion and worn after oxidation.