Abstract: The control of metallic friction and wear by applied voltage is a new prospective technique in tribology,by which the metallic friction and wear in dry friction condition can be reduced effectively. But the reports on this method were rarely seen.The self-generated voltages and friction coefficients on some metallic friction pairs are measured simultaneously by a ball-disc type friction and wear tester.The results showed that the correlation between friction force and th self generated voleage.The effect of slef generated voleage on metallic friction force was also inestigated was also investigated.The test results indicated that the friction coefficient is the smallest when the self-generated voltage is counteracted by the applied voltage.Comparison with that of no applied voltage acts,the frcition coefficient can be reduced by 12% to 26%through the voltage counteracted method.