The bioceramic films containing hydroxyapatite (HAP) were synthesized on Ti-6Al-4V alloy surfaces using the micro-arc oxidation technique. The influences of electric current density and treating time of micro-arc oxidation on the phase behavior of the bioceramic films were Studied. XRD and SEM were utilized to characterize the phase formation and Surface morphologies of the bioceramic films The. results revealed that electric current density and micro-arc oxidation time were two important factors for the formation of HAP, and the micro-arc oxidation films were composed of HAP, TiO(2), and Ca(3)(PO(4))(2).(C) 2008 Elsevier Ltd. All rights reserved.