Abstract: The main structural form of a cylindrical airborne omni-directional antenna is introduced in this paper. In order to solve the problems of cracking of the radome flange, deformation of the printed circuit board and the poor interchangeability, the overall antenna structure is optimized under the premise that the electrical and mechanical performances of the antenna are ensured. The design of radome-cover with a fixed base split type, polymethacylimide (PMI) foam packing and optimizing the fixing method of the printed circuit board are put forward. As a result, the structure strength and assembly interchangeability of the overall antenna have been greatly improved. Finally, the optimized antenna structure is simulated and tested to verify the structure strength and reliability of the antenna. This optimization design scheme greatly improves the reliability of the antenna products, reduces the cost of scrapped products due to quality problems and provides a good reference value for the design of this type of antenna.