Low glycemic index diets have little effection on human blood sugar level,help improve the human health,prevent of diabetes,and control the blood sugar level of patients with diabetes. In this paper,we used raw oat and raw milk as material,by adding vitamins,minerals,dietary fiber and other nutrients developed an oat milk with high nutritional value and unique flavor. Through single factor test and orthogonal test,the optimal scheme was determined as follows： the addition amount of starch was 1.6%,of maltitol was 4.0% and of oat granules was 3.0%. The oat milk had a unique aroma of cereal and milk,which was mellow and palatable,and can keep stable. This research had great practical significance of developing dairy products for diabetic patients,promoting the healthy development of our country's dairy industry.