Abstract: To investigate the motion and breakage characteristics of flexible sphero-cylindrical particles in a fluidized bed, this study adopts a computational fluid dynamics-discrete element method (CFD-DEM) to establish a numerical model of flexible sphero-cylindrical particles based on a fiber model. Flexible particles are simulated by connecting sphero-cylindrical elements with virtual bonds, and particle breakage is determined using tensile and shear stress criteria. The effects of particle flexibility ratio and inlet gas velocity on particle velocity, average particle height, and breakage rate are analyzed. The results show that an increase in the flexibility ratio leads to an increase in particle rigidity, significantly enhancing the breakage rate, while an increase in inlet gas velocity intensifies particle collision strength, accelerating the breakage process. The study reveals the impact of particle flexibility characteristics on motion and breakage, providing guidance for the optimal design and operation of fluidized beds.