In order to investigate the friction and wear properties of polymer materials used for mechanical seals of ship stern shafts in actual working environments,five materials,namely,cast polyurethane elastomer(CPU),polyethylene terephthalate(PET),polybutylene terephthalate(PBT),glass fiber modified polyhexamethylene butylamine(GF/PA46) composite,and glass fiber modified polytetrafluoroethylene (GF/PTFE) composite,were selected,and their friction and wear performance tests were conducted under the load of 0.5 MPa and the linear velocity of 7 m/s.The results show that CPU,PET,PBT,GF/PA46 materials exhibit varying degrees of peeling and furrowing under high load and high rotational speed conditions,resulting in large friction coefficients and wear losses,while GF/PTFE composites only exhibit some relatively slight tears and wear marks,exhibiting optimal friction and wear performance.Compared to CPU,PET,PBT,and GF/PA46,the average friction coefficient of GF/PTFE is decreased by 66.6%,80.4%,86.1%,and 87.8%,respectively,and the wear amount per unit time is decreased by 91.7%,92.7%,88.6%,and 97.0%,respectively.The friction and wear performance is optimal.