ZrO2-based composite film containing Ca and P was prepared on the surface of pure Zr by micro-arc oxidation （MAO） under constant anode voltages. The thickness

morphology

phase constituent and Ca

P contents in surface of the film investigated with anode voltages of 300 V

350V and 400V. The results reveal that MAO zirconia films exhibiting porous structure is mainly composed of tetragonal zirconia （t-ZrO2） and monoclinal zirconia （m-ZrO2） containing Ca and P

in which contents of P and Ca in the pore are lower than those on the film surface and along the pore edge. With increasing in anode voltage

the thickness of film

the aperture of pore and the t-ZrO2 content are increased

while the m-ZrO2 phase is slightly decreased. In addition

on the surface of film

the Ca and P contents are increased

and the increase of Ca content is obviously faster than that of P content

resulting in the increase of Ca via P ratio.