The maintainability of equipment is determined by a series of indexes, the scheme of maintainability rise should derive from multi-properties optimization. The theory of data envelopment analysis (DEA) is good at evaluating the units with multiproperties. Used in scheme optimization of maintainability rise, the theory of DEA can not only rank all sample schemes but also show clearly the shortcomings and reform trend for the non-classic schemes by building frontier, and then make the non-classic schemes be best among all sample schemes after the shortcomings adjusted. Then the feasibility and adjust measure for suppositional decision making units could be obtained based on the foregone samples with the help of theory of DEA.