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In order to improve the low hardness and low wear resistance of Ti-6Al-4V alloy, plasma carburization and CrN coating were carried out. After composite surface treatment, the carburized layer was about 150 mm in depth and CrN coated layer was about 7.5 mm in thickness, respectively. Based on XRD diffraction patterns, preferential growth along (111) direction was observed. The hardness(Hv) was significantly improved up to about 1,960 after plasma carburized/CrN coating while the hardness value of original alloy was 402 before treatment. This result might be associated with TiC carburized layer and CrN coating formation on the surface of Ti-6Al-4V alloy and such high value of hardness dramatically improve the wear resistance. Through the adhesion test of coating, critical load was as high as 32N as compared with the simply processed CrN coating of a 18N.