The sliding plate of high-speed pantograph faces the extreme operating environment of high sliding speed,high voltage and high current.The complexity of the operating environment is bound to affect the service life of the sliding plate.In order to study the current carrying friction and wear mechanism of metal impregnated carbon strip of high-speed pantograph,the real working conditions of high-speed pantograph strip were obtained by tracking and monitoring the metal-impregnated carbon strip of a high-speed train pantograph.The surface morphology,surface element distribution and surface roughness of metal-impregnated carbon strip after high-speed operation wear were analyzed by scanning electron microscope,electron probe and white light interferometer.The results show that the main wear mechanism of metal impregnated carbon sliding plate is adhesive wear.The abnormally bright area in the middle of the metal-impregnated carbon strip is mainly composed of a large number of carbon elements,and it may be that the stagger value of the catenary is not set when the strip slides in and out of the station and the depot,resulting in obvious abnormal wear in the middle of the strip compared with other areas.The composition analysis of the wear surface of the strip shows that the proportion of oxygen atoms on the strip surface is high,indicating that a certain redox reaction has taken place on the sliding plate surface.