On the basis of evaluation results, all decision making units (DMU) were ranked by using binary relative evaluation.According to output-DEA models, this paper analyse the return to scale of DMU.

• 在评价结果的基础上，通过DEA二次相对评价法对所有决策单元进行了排序，并根据输出DEA模型分析了各决策单元的规模收益状况。