The friction and wear behaviors of copperimpregnated metallized carbon strip/Cu-Ag alloy contact wire with current were experimentally studied on a ringblock type tester under the condition of current from 200 A to 400 A,normal load from 15 N to 40 N and sliding speed from 40 km/h to 120 km/h.The results indicate that the friction coefficient decreases with the increase of current and sliding speed,and increases with the increase of normal load.The wear loss of carbon strips increases with the increase of current and sliding speed.When the current is small (such as 200 A),there is a threshold between the wear loss and normal load,when the current is large (such as 400 A),the wear loss decreases with the increase of normal load.The temperature of carbon strips increases with the increase of current,and decreases with increase of normal load.When the current is small (such as 200 A),the temperature of carbon strips increases with the increase of speed,when the current is large (such as 400 A),the temperature of carbon strips decreases with the increase of speed.When the current is between 200 A and 300 A,the mechanical wear is a main wear mechanism,when the current is between 300 A and 400 A,the oxidative wear and arc ablation are two dominant wear mechanisms.