Abstract: The process of a sphere impacting a flexible elongated particle bed was simulated using the self-developed code of Discrete Element Method (DEM) and validated with impact experiments. The influences and mechanisms of various parameters on the mechanical response of the impact with a sphere were investigated, such as particle friction coefficient, length and arrangement. The numerical simulation results show that stronger force chains within the particle bed can be generated with the increasing of the friction coefficient between flexible elongated particles, which enhances its resistant ability to impact deformation and intrusion of impactor. For arbitrarily arranged flexible elongated particle medium, the rebound of the impactor becomes more obvious with the increasing particle friction coefficient and particle length. For regularly arranged flexible elongated particle medium, the resistance of the parallel arrangement beds to the penetration of impactor is much stronger than that of the orthogonal arrangement of flexible elongated particle beds.