To enhance the property of YG8 hard alloy,two elements of carbon and vanadium were implanted into its surface by using Metal Vapor Vacuum Arc(MEVVA) source with several different doses.The structure of sample surface is characterized and analyzed with metallurgical microscope,X-ray diffraction and Raman spectrum,respectively.The results show that there exist new phases of C,VC,and V7O3 in the sample surface,and that C+V ion implantation actively promotes the formation of DLC structure.Moreover,it can be found that the performances of sample surface(such as microhardness,coefficient of friction and corrosion resistance) are evidently improved.In conclusion,the surface modification of YG8 hard alloy by C+V ion implantation is not only affected by the appearance of new phase,but also related to the implantation mechanism.