The optimum extraction conditions of drying roasting naked oat starch were obtained by single-factor experiment and orthogonal experiment as follows, material-water ratio 1∶18, pH value 9.5, extraction temperature 50℃ and extraction time 60min. Under these conditions, the extraction rate could amount to 57.54%. At the same time, physical and chemical properties of dry roasting naked oat starch were determined. The results showed that amylose content, blue value and gelatinization temperature of the starch decreased.