Abstract: Based on the Desheng Sports Center Stadium project in Shunde, this paper starts from the key difficulties of the project and focuses on the feature of site conditions, complex roof shape, and limited support conditions. It discusses and analyzes the overall roof structure scheme, proposing an arch structure system that is compatible with complex architectural shapes and can achieve spatial synergy. The stadium roof combines the giant arch structure, tensioned cable grid structure, and a visiting corridor structure with a sightseeing function, effectively addressing the requirements of large span, large cantilever, and the need for visitor activities. The main feature of this system is the use of the four landing cylindrical shape of the roof to set up four giant lattice columns, which, together with the inner ring triangular trusses, form a giant arch structure system with spatial synergy. Once the scheme is determined, the analysis of the giant arch structure system focuses on load analysis, deformation control, and load-bearing capacity check to ensure the reasonable transmission and safe stability of the giant arch structure system. The tensioned cable grid structure is analyzed and designed for cable forces to ensure that the cables do not slack under the most unfavorable working conditions. The complex and critical nodes of the project are analyzed using solid finite element analysis, and through force calculations and structural reinforcement, it is ensured that the nodes work elastically under complex stress conditions. Finally, the analysis and comparison of the monitoring data of the roof steel structure are conducted, including the deformation and stress changes of the steel members before closure, after closure, during the dismantling of the formwork, and during the secondary installation of the roof. The results show that all monitoring data did not exceed the design warning values and met the design requirements. The comprehensive analysis shows that the large-span and complex steel structure of the stadium project using the giant arch + tensioned cable grid + visiting corridor structure system has sufficient stability and safety redundancy. The structural system and design method can serve as a reference for similar projects.