The aim of this study was to analyze the situation of agricultural ecosystem in Loudi City, and explore the level of its sustainable development. By Emergy methods, we have analyzed the imput and output of this system in 2014. The result showed that: in 2014, the gross energy input is 2.33E+22sej, and the gross output is 2.20E+22sej. Through analyzing the energy index system, we get the result that this system has a low energy output rate and a high environment load rate. It means that this area facing pressures from eco-environment and weak...