Food freshness indicator intelligent packaging is developed based on characteristic color reactions, temperature-activated biological reactions and enzyme activations caused by characteristic gas and specific reagents released during the storage process of food products, and thus can be used to help consumers intuitively, accurately and scientifically judging the quality and freshness of foods. Food freshness indicators had important application values in real life. In this paper, based on the induction and analysis of the domestic and foreign freshness indicator intelligent packaging, the instruction principle research status and indications of the freshness indicator were explained from two aspects: the food freshness indicator application type and the freshness indicator substrate. The production process and material selection of the agent substrate, summarized the existing research results, pointed out the problems that still existed in the research and the direction of future research prospects and put forward reasonable research suggestions, aiming to study food freshness indicator technology more deeply and provide the reference.
