The main structure of an arched roof library in Yangjiang City is a reinforced concrete frame structure system,and the upper roof is a large-span reinforced concrete arch structure.Discusses the characteristics and structural layout principles of the arched roof library project.Utilize two analysis software,Yingjianke YJK and MIDAS Gen,to perform small earthquake elastic calculations and medium earth-quake verification calculations on the overall structure,as well as small earthquake elastic-plastic time history analysis.Conduct specialized fi-nite element software analysis on key components such as bottom curved shear walls and floor stress with large openings.The calculation and analysis results indicate that all performance indicators of the overall structure meet the requirements of the specifications,verifying the rationality of the structural system.The component analysis results and bearing capacity review meet the requirements of use,and the design is safe and reliable.