Abstract: Diamond-like carbon (DLC) film was prepared on the surface of Ti alloy by liquid electrolysis. The structure of the DLC film was analyzed using Raman spectrometry and Fourier transformation infrared spectrometry. The friction and wear behavior of the DLC film was evaluated using a ball-on-disc friction and wear tester. The adhesion strength of the DLC film to the Ti-alloy substrate was also determined using the ball-on-disc test rig in a scratch mode. The Worn surface morphologies of the DLC film at different loads were observed using a scanning electron microscope. It was found that the resulting DLC film was composed of sp~3-C and sp~2-C and contained hydrogen. It had good friction-reducing and antiwear abilities, i.e., almost no wear was detected at a relatively small load and the friction coefficient kept almost unchanged during the whole sliding stage at a small load. Moreover, the DLC coating had a critical load as high as 0.882 N, indicating that it could be suitable to the surface modification of the Ti alloy used for artificial joints implantation.