Abstract: The central buckle plays a significant role in improving the dynamic characteristics, short suspender bending and the main beam longitudinal displacement of long-span suspension bridge. However, there are few studies on the stress performance of the central buckle. The central buckle is studied and the formula for calculating its lateral stiffness is derived by the mechanical method. Through the sensitivity analysis, it is confirmed that the inclination angle and the axial stiffness of the rod body are the main factors affecting the lateral stiffness of the central buckle. Multiple rigid central buckles is studied, in which the main cable axial stiffness is not significantly different from that of the central buckle, and thus the main cable has a great influence on the central buckle internal force. The central buckle and the main cable form a series-parallel spring system, and the force distribution is more complex. By adjusting the inclination and axial stiffness of the rod body, multiple pairs of central buckles with different lateral stiffness are set to achieve coordinated stress.