<p>Traditional 5G communication tower structures typically consist of cylindrical pipes or rectangular frameworks. However, these designs face significant challenges, including poor weather resistance, excessive weight, high strength and stiffness reserves, and complex assembly processes. These issues conflict with the goals of low-carbon and sustainable development. Therefore, this study seeks to innovate and transform material selection and structural design optimization to meet the needs of modern 5G communication towers. To achieve this, a high-precision finite element model of the 5G communication tower was developed, integrating live loads, equipment loads, ice loads, and wind loads for coupled mechanical performance analysis, followed by modal analysis. Based on this, a mathematical model for multi-objective lightweight optimization was established. Finally, the optimization effectiveness was validated through finite element analysis, including coupled mechanical analysis, modal analysis, seismic analysis, and buckling analysis. As a result, the weight of the 5G communication tower was reduced by 28.89% compared to single-pipe towers of the same height (35&#xa0;m). In contrast to traditional triangular towers, this innovative design employs 60° weathering angle steel for the main columns, enabling modular installation, lightweight construction, and enhanced weather resistance, thus meeting durability and design standards. The findings not only improve the mechanical performance of 5G communication towers but also offer valuable insights and references for the analysis and optimization of similar structures in practical engineering applications.<?oxy_aq_start??>Journal instruction requires a city and country for affiliations; however, these are missing in affiliation [1, 2, 3, 4]. Please verify if the provided city and country are correct and amend if necessary.<?oxy_aq_end??><?oxy_aqreply_start??>That's right.<?oxy_aqreply_end??></p>