Abstract: Due to undesirable data in the inputs and outputs,the standard Data Envelopment Analysis(DEA) model carat be directly applied to evaluate the efficiency of environmental protection project.In this paper,by using undesirable data translation,transforming undesirable outputs into inputs and undesirable inputs into outputs,reversing undesirable data,the undesirable data can be included in the standard DEA model,the relationship among the three efficiency measures is analyzed,the approach broadens the scale of DEA application. A sample of this efficiency measures is given.

Key words: DEA, data processing, environmental protection projects, efficiency