Methods of production ecology (energy and nutrient budget) are usually applied to make a quantitative analysis of the structure and the function of ecological system,input-output method is widely used to analyse quantitatively the structure and the function of economic system. A method including both the former and the latter,which can be used to study synthetically the quantitative relations between the natural reproduction and the economic reproduction, of agriculture, and the structure and the function of ecological system and economic system of agriculture as well as their relationships, is presented in this paper. Based on the inputoutput analysis achieved by applying this method, the ecological-economic models and the optimization models for agriculture can be built up. The data in the list of nutrient substance flows proposed by "the symposium on cycles of mineral nutrition in agricurtural ecosystems"(Amsterdam, 1976), are processed by this method. It will be seen from this that the same results will be achieved and Amsterdams model will be precised and systematized.