The modal analysis is performed on the single beam string structure in a practical project in this paper. Then the response history analyses, under the four different earthquake-induced ground motions in the single direction, are implemented on the structure. The analysis results indicate that it is very necessary to install out-of-plane bracings for the single beam string structure. In the design of similar structures, the section dimensions of the struts can be appropriately reduced due to the average stresses of the struts being smaller, and cross beams near the middle of structures are be given attention. And the analysis results provide a reference for the seismic analysis and design of similar structures.