In this study, the shelf life of cereal auxiliary food for infants and young children made by drum drying and packed in tinplate cans with nitrogen filling was studied. Through accelerated destructive experiment, the chemical quality decay kinetic model was established for the first time, and the shelf life at room temperature was inferred according to the decay of nutrients. The results show that the water activity of cereal auxiliary food for infants is between 0.2~0.3. During the accelerated test period of 4.5 months, the decay rates of DHA and AA are the fastest. According to the variation of each nutrient index, we conclude that the shelf life of products can exceed 20 months.