Arthroplasty is the most effective method for the treatment of joint disease in clinical practice, and there are increasing needs for artificial joints with the development of national economy. There are three types of artificial joints in clinical practice. Lots of methods have been used to enhance the wear and corrosion resistance of artificial joints. Diamond-like carbon (DLC) film has low friction coefficient, high wear resistance and good biocompatibility, which has been used to improve the wear and corrosion resistance of artificial joints. But the clinical use of DLC coated artificial joint is unsatisfying. This paper discussed the reasons for DLC failure in vivo. Metal doping DLC film or multilayer DLC film could lower the internal stress, improve the adhesion and postpone the DLC film failure. Concerning the service environment of artificial joints, the crevice corrosion and adhesion of DLC film, we proposed to control the formation of biofilm on the surface of the artificial joints through the use of metal ions to promote protein denaturation and decomposition. And this biofilm could prevent corrosion medium (Cl-, PO43-) from penetrating into the interface of film and substrate. So the crevice and interface corrosion would be restrained. And the lifetime of DLC film would be prolonged.