The nature of the pull-out system of carbon nanorope/polyethylene (CNRP/PE) composite is studied by using molecular dynamics approach.The deformation of the CNRP/PE composites in pull-out process is exhibited.The influence of twisting deformation on the interfacial interaction of the composites is investigated.The results show that the energy of the pull-out system is conserved;and the interfacial bonding is weak resulting in a sliding failure of the CNRP inside PE matrix.