Aircraft tires endure significant impact loads during takeoff and landing, increasing inflation pressure that is primarily borne by bead wires. Thus, enhancing aircraft tire bead fatigue resistance and optimizing structural stress distribution are crucial for radial aircraft tire design and development. Compared with polygonal bead wires, those with a circular cross-section have significant advantages in stress variation under load, and their production and application are increasingly mature. This paper explores the structural principles, application scenarios, and selection methods of circular bead wires, laying a solid theoretical foundation for product structure optimization and quality improvement.