为了研究和优化地基大口径望远镜系统的整体性能，对其整系统进行了有限元建模和分析。针对1.23 m口径的光电望远镜，研究了望远镜各部件的结构特点及连接关系，论述了相关部件的简化方法，建立了整系统的有限元模型。计算了当望远镜指向天顶和水平状态时系统的重力变形情况，给出主次镜的变形结果。分析了望远镜在风载和地震波载荷作用下的动态响应情况并给出了响应结果。分析表明：风载作用将引起望远镜主次镜光轴偏心，其偏心误差RMS值为0.025″，满足系统设计要求；地震波引起主次镜在3个方向上的位移较大，但最大应力为16.67 MPa，不会破坏望远镜系统的结构。

To research the performance of ground-based large telescopes and to optimize the design and structures of telescopes,the finite element analysis for the whole assembly was performed. For a 1.23 m telescope,the structural characteristics of main parts and their relation were studied,several kinds of simplification methods for some parts were discussed and a precise finite element model of the whole telescope assembly was established. Moreover,the gravity deformations of the telescope in both zenith and horizon pointing states were calculated and the deformation results of the primary mirror and the secondary mirror were given. Finally,the telescope assembly dynamic responses due to the wind loading and seismic excitation were analyzed. The obtained results show that wind loading will induce the optical axis misalignment of the primary mirror and secondary mirror, and the misalignment error RMS value is allowable in 0.025″. The displacements along three orthogonal directions induced by seismic excitation are greater, but the maximum stress is only 16.67 MPa, which cannot bring the damage to telescope structures.