Abstract: Energy provides power for all the ecosystems. Emergy evaluation is a kind of environmental accounting method used for analyzing thermodynamics in open systems based on energy, which uses emergy as the standard to measure different forms of energy and focuses on ecological and economic benefit. This paper introduces the background for the emergence of energy analysis method, its concepts and pastoral connotative, summarizes the advances of the study on energy analysis method, and analyses the essential features and problems in energy analysis from the following six seven aspects: Quantization emergy, maximize emergy, time scales of emergy, distribution of emergy, relation between emergy and thermodynamic parameters, emergy and economics. It indicates that the energy analysis methods which were used in the past have some limitations such as, the method is too simplification and can result in misleading and inaccurate results, although energy analysis bases on the law of thermodynamics, system theory and theoretical ecology, that can quantize the ecosystem service values of the products for human beings survives which is difficult for many other evaluation methods to accomplishing. Therefore, further improvement and development are also awaited in energy analysis method. By the comprehensive analyzing, the main research interests for emergy evaluation in the future are select proper parameter, quantize emergy, comprehensive emergy evaluation methods, clear the relationships between emergy and thermodynamic parameters, and the process of emergy formation in time scales.