The history of food processing and human progress come down in one continuous line. And food processing is meeting demand for food constantly. So， food processing is necessary in human progress and it is realistic memory of human civilization. Under the influence of commodity economy and misunderstanding of food processing， food industry pursues ultra-processed food in order to get high profits， and in this process food industry ignores sustainable development of human health and the environment， which causes ultra-processed foods are popping up on the market. And this brings new challenges to the transformation and development of food industry. The relationship between the degree on food processing， human health and social and economic development needs to be considered and studied. In order to accomplish the sustainable development of food and promote the continuous progress of social civilization and human nutrition and health， the significance and necessity of food processing to food safety and human health would be understood scientifically. Besides， the potential harm of "excessive" food processing should be realized and solved.