With regards to the interchanging features of agricultural pollution and its negative impacts on China's eco-environment such as environmental degradation, this paper, by fully taking into consideration the gap in environmental technology, incorporated the extended SBM directional distance function and Metaconstraints effi ciency function to estimate China's agricultural environmental effi ciency (roughly three regions: eastern, central, and western China), and employed the panel model to study the environmental Kuznets curve's (EKC) characteristics and the causes of regional differences in agricultural environmental effi ciency under levels of different environmental technology. The study showed that, due to the signifi cant differences in agricultural environmental production technology among the three different regions, agricultural environmental effi ciency presented a pattern of progressive decline, for instance; eastern China > western China > central China. Although the agricultural environmental technology of eastern China can reach 96.92% of the potential meta-constraint technology level, agricultural environmental technology of central and western China only reach 83.71% and 79.37% of the potential meta-technology constraint, respectively. The EKC curve of agricultural environmental effi ciency was proved to be supportive of the circumstances in China; however, as a result of the gap in environmental technology, the EKC curves of different regions presented different turning points and stages. In addition to agricultural economic growth, openness of trade, proportion of agriculture, agricultural technological level, income gap, and fi scal support to agriculture have a signifi cant effect on agricultural environmental effi ciency, but both the impact direction and the impact extent of these factors on agricultural environmental effi ciency are different.