从整机动力学的角度,提出一种量化各种结构改进设计对整机性能收益的评估方法——结构效率,其内涵应当包括发动机质量有效承载项,模态参与项以及变形量协调项,并建立初步分析方法.通过某转子/支承系统的结构优化算例,指出了结构效率在整机结构设计中的优越性,并对结构概率的进一步研究前景和研究重点进行了论述. From the perspective of machine dynamics, this paper proposes a method to quantify the benefits of various structural improvement designs to the whole machine performance-structure efficiency, whose connotation should include the effective bearing capacity of engine mass, modal participation and the coordination of deformation, And a preliminary analysis method is established.Based on the structural optimization example of a rotor / support system, the superiority of structural efficiency in the structural design of the complete machine is pointed out, and further research prospects and research focuses on the structural probability are discussed.