A blockonring test apparatus was used to study friction and wear behavior of the PantographOCS system of a highspeed train.Many parameters that affected the wear volume of the contact strip and the energy of arc discharge were considered in the experimental test,including the contact force between the contact strip and the contact wire,sliding speed of the strip,electric current and running time.The prediction formulae of wear volume and arc discharge energy were established using the partial leastsquare(PLS)method,and the contribution of each parameter on the slide wear volume was analyzed.Results show that the magnitude of arc discharge energy has the biggest effects on the strip’s wear volume,followed by the speed,running time and current.The magnitude of the current has the biggest effects on the arc discharge energy,followed by the speed,running time,and contact pressure.The optimization of the wear volume of contact strip and the energy of arc discharge was studied,based on the prediction formulae of wear volume and arc discharge energy and using Ideal point method,which provides theoretical foundation for electric locomotive running in a specific interval.