Food economic management is a new and cross discipline in the world.By comparing the research levels of the food economic management at home and abroad,based on system engineering theory and methods,it is necessary to set up body of knowledge for food economic management discipline.Based on food system theory,it puts forward to 5 stages in food life cycle.The five stages are food producing,food distribution,food trade,food use,and food recall.According to the food natural attributes and social attributes,it...