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The simulated-annealing basin-hopping(SABH)method[1]implemented into LAMMPS[2](Large-scale Atomic/Molecular Massively Parallel Simulator)has used to constructed the stable structures of polyethylene/Ag nanoparticle(PE/AgNP)composites,which can reflect the real sample configurations in the corresponding experiments.The SABH results indicated that both PE/AgNP composite and pristine PE material exhibit isotropic amorphous structures and PE/AgNP composite display a higher density than that of pristine PE.