结构灵敏度分析在工程领域具有广泛的意义。针对现有结构灵敏度分析方法中存在的问题，借鉴于模态综合技术在计算上的简便性，提出并建立了结构灵敏度分析的子结构方法（ＳＳＳＡ法）。在理论分析的基础上，编制了有限元程序，并对固支梁进行了验算。提出的方法适用于一般结构系统，对大型复杂结构当更为有效。 Structural sensitivity analysis has extensive implications in the engineering field. Aiming at the problems existing in the existing structural sensitivity analysis methods, and referring to the ease of calculation of the modal synthesis technology, a substructure method (SSSA method) of structural sensitivity analysis was proposed and established. Based on the theoretical analysis, the finite element program was compiled and the fixed beam was checked. The proposed method is suitable for general structural systems and is more effective for large complex structures.