The TiCN coatings were deposited on Ti6Al4V alloy by arc ion plating technique. Inorder to improve the adhesion of TiCN coating, the buffer layer of Ti and TiN was prepared between titanium substrate and TiCN coating. It is studied on effect of buffer layer on dynamic wear resistance of TiCN coating on titanium alloy in artificial seawater. It shows that The all TiCN films have dense structure with a total thickness of about 2μm. The TiN/TiCN coatings have a higher hardness of 30 GPa. The TiN buffer layer has a higher adhesion for the TiCN coating and Lc1 and Lc2 are 60N and 80N respectively. The TiN/TiCN coatings have a excellent wear resistance with a lower friction coefficient and wear rate.