The micro-arc oxidation method is employed to make the highly hardness ceramic layer on the surface of TC4 titanium alloy. The Al2TiO5 is the main crystal phase of the layer. The hardness of the ceramic layer is raised to 1150 HV0.05 and decreased subsequently from interface to surface. It is indicate that the compact layer could protect the substrate effectively in fretting wear test. At the initiate state, loose coating start to break and the severe wear will be occurred in friction pair. While it is stable, the abrasive dust which produced through mashed fruiting body of loose coating will be expelled from the wear zone and the sliding wear turns to be the main style as the compact layer replace loose coating gradually. At the stable state, the metal material transferred from the friction pair to compact layer for the wearability of it. Thus, the compact layer of ceramic layer fabricated by micro-arc oxidation could protect the substrate effectively in fretting wear test.