This paper introduces a new titanium alloys surface strengthening treatment by using the technique of the arc-added glow discharge plasma non-hydrogen carburizing. High purity and high strength graphite is selected as cooling cathode arc source for supplying carbon atoms. These atoms and particle migrate to the titanium alloy (Ti6Al4V) surface and form carburizing layer. The tribological property of titanium alloy surface was enhanced notably. At same time, titanium alloy avoids the hydrogen brittleness.. The carbonized layer obtained a thickness of 25similar to30 mum at 980 similar to 1050degreesC, 20 similar to 30 minutes. The microhardness of the Ti6Al4V alloy surface attains 936 HV and the coefficient of friction declines to 0.08. Usually, the friction coefficient of Ti6Al4V is 0.50 or so. The research expresses that the carburizing layer is composed of TiC and dissociative Carbon. Tribological properties of non-hydrogen carburizing layer were evaluated using a ball-on-disk wear tester (sliding with GCr15 balls). Results showed that the wear resistance of specimen with non-hydrogen was much higher than that of untreated Ti6Al4V alloy.