提出了一个适用于机床结构系统动态性能分析的高效而精确的计算方法．通过对机床中零件间多种复杂连接关系的研究，建立了分析模型装配技术，从而把零件有限元分析、结合面特征与模态综合紧密集成在一起，同时，为了提高模态综合精度和满足机床结构薄弱区域识别的需要，建立了若干新的计算公式该方法具有计算速度快、精度高，对硬件环境要求低等优点，为结构布局修改及优化设计提供了高效手段． An efficient and accurate calculation method for dynamic performance analysis of machine tool structural system is proposed. Through the research on the complicated connections among the parts in the machine tool, an analysis model assembly technology is established, so that the finite element analysis of the part, the combination of the surface features and the modal synthesis are tightly integrated. Meanwhile, in order to improve the accuracy and satisfaction of the modal synthesis, This paper presents several new calculation formulas which have the advantages of fast computing speed, high precision and low requirement of hardware environment, which provides an efficient method for structural layout modification and optimization design.