中文摘要：

本文比较了非期望产出处理的相关DEA模型的优缺点，通过引入SBM模型处理非期望产出，测算了1990—2006年我国各省区环境效率。结果显示，环境变量的引入明显降低了中国区域的平均效率水平，中西部地区对环境变量的引入较东部地区较为敏感。同时，本文实证考察了经济规模、对外开放程度、地区等因素对环境效率的影响效果，发现这些因素对对于三大地区的作用机理存在差别，并据此给出了一些政策性建议。

英文摘要：

After reviewing relative undesirable outputs DEA literatures and comparing their advantages and shortcomings, the current paper introduces SBM models to treat undesirable outputs and then measures the eco-efficiency of each province in china between 1990 and 2006. Some conclusions are as follows： after incorporating in the environmental pollution variables the mean eco-efficiency decreases obviously. The mid-western area has the stronger sensitivity to environmental constraints. Meanwhile, econometric analysis indicates a number of variables that has important effects on eco-efficiency, including variables relating to economy scale, openness, area and so on. We find that these variables have different effects on the three districts. In addition, policy implications are discussed.