Abstract:Coarse cereals，with rich dietary fiber，resistant starch，and oligosaccharides，have many biological functions such as regulating blood sugar，and serve as the ideal raw materials for low glycemic index（GI）food.In the present study，the formula of quinoa coarse cereal porridge with low GI was obtained by D-optimal mixture design with quinoa as the main raw material，and oat，coix seed and buckwheat as the auxiliary ones，and optimized by response surface methodology.The results showed that the optimal formula of quinoa coarse cereal porridge （100 g）with low GI consisted of 35.00 g of quinoa，31.81 g of oat，16.75 g of coix seed and 16.44 g of buckwheat.The coarse cereal porridge under this formula had a good taste.The sensory score was 87.03，and the estimated glycemic index（eGI）value of the porridge was 50.77，lower than 55，meeting the requirements of low GI food.