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PHM evaluation index is not only the system design input and objective requirements of PHM system, but also the evaluation basis for acceptance and verification of PHM results. Lots of PHM technology research work has been carried out in recent years. However, due to the lack of establishment of PHM system index system, PHM system lacks a unified acceptance evaluation standard in the design stage and finalization stage, which makes the engineering process of PHM system slow. This paper takes the typical electromechanical system as the research object, through analyzing the advanced PHM technical standards and specifications at home and abroad, combined with the capability requirements of PHM system of typical electromechanical system, establishes the PHM evaluation index system of electromechanical system suitable for equipment design and verification, and solves the problem of lack of design basis and verification evaluation index in equipment PHM system design.