黄河三角洲地区位于沿海开放地带，经济地位特殊而重要。而三角洲又是生态环境脆弱带，在资源开发中承受着巨大的环境压力。环境与经济的协调发展是黄河三角洲永恒的主题。基于能值理论与方法，通过一系列能值指标的建立，对黄河三角洲地区环境经济系统进行了分析评估，结果表明该地区能值用量较大， 经济迅速增长的同时，资源消耗与环境问题日益突出。在此基础上，通过可持续性能值指标的动态分析为该地区实现可持续发展提出建议

As an ecologically vulnerable region where atmosphere, hydrosphere, geosphere and biosphere interact, the Yellow River Delta plays an important role both in economy and environment in China. The emergy theory is based on the theory and methods of the System Ecology. Forming 1J higher quality energy will need a large amount of lower quality energy. In other words, different forms of energy have different attributions. By dealing with the energy-value-process of ecosystem, the theory provides us with a new approach to the economic ecology. Based on emergy analysis, this article systematically analyzes energy, resource flowage and condition of eco-economy system in the Yellow River Delta. On the basis of the evaluation indicator system, resources-environment-economy system in the Yellow River Delta is assessed comprehensively. The results indicate that the total emergy consumption of the study region is about 1.76×1022sej,or about US$ 8.42×109. The waste emerge evacuated from the study region reaches about 5.74×1021sej,or about US$ 2.74×109, which indicates that environment in the Yellow River Delta degenerates rapidly because of the industrialization and economic increasing. Finally, based on the calculation of the emergy sustainable indices (ESI), we find that economy increasing of the study region depends on resources consumption. Although the value of resource reserves in the Yellow River Delta reaches US$ 4.45×1012 (about 529 times larger than GDP), it is difficult to use it adequately because of technical limits. So enhancing the resources utilization efficiency and reducing waste are the primary tasks in the future in order to realize sustainable development in the Yellow River Delta.