The effect of lowvoltage and highcurrent on the friction and wear behavior of carbon strip/CuAg alloy contact wire was studied on a highspeed electric sliding test machine under a constant AC and the sliding velocity of 150 km/h and the contact forces from 60 to 120 N.The results show that under the condition of lowvoltage and highcurrent,the main form of arc discharge between carbon strip/CuAg alloy contact wire is short arc discharge with large arc discharge area and high arc energy.The main wear mechanisms of the carbon strip include arc ablation wear,delamination,melting,vaporization and slight mechanical wear.The wear volume of the carbon strip and arc energy is increased sharply with the increasing of the electric current.The friction coefficient is increased first and then decreased with the increasing of electric current.When the current is constant,the arc energy is increased first and then decreased with the increasing of the contact pressure.The wear volume is decreased with the increasing of the contact force.