The pantograph copper impregnate carbon strip with abnormal wear in the winter operation of a domestic subway line was studied.The differences in surface morphology,microstructure and chemical composition between the carbon sliding plate surface with normal wear and the carbon sliding plate surface with abnormal wear were compared with a variety of microscopic testing methods,so as to explore the causes and mechanism of the abnormal wear of the carbon strip.The results show that,compared with the carbon sliding plate in normal wear state,the three-dimensional surface topography of the carbon sliding plate in abnormal wear state is rugged and rough,the friction conditions deteriorate significantly,and mechanical abrasion wear,abrasive wear,arc ablation and material transfer are increased.When at the autumn and winter seasons,the surface lubrication conditions of carbon strip change,the number and diameter of the abrasive particles increase,and the temperature of the contact pair rises,which aggravates the abrasive wear and arc ablation,resulting in abnormal wear of the carbon strip.After tracking and monitoring the operation process of subway,it is found that the occurrence of abnormal wear of the carbon strip is related to the decrease of environmental humidity in the tunnel.