To　investigate　the　aging　process　of　AC　PDPs　manufacturing,　Mg-Zr-O　protective　films　were　deposited　on　glass　substrates　by　magnetron　sputtering　method,　and　made　into　macroscopic　discharging　cells.　The　aging　of　discharge　cells　was　accomplished　with　different　time,　and　discharging　voltages　(the　firing　voltage　and　the　minimum　sustaining　voltage)　of　them　were　measured.　Results　reveal　that　the　firing　voltage　V-f　and　the　minimum　sustain　voltage　V-s　are　reduced　by　about　18V　and　10V　in　the　initial　aging　process　(0　similar　to　20　min)　respectively,　then　tend　to　be　constant　as　the　aging　time　increases　further.　The　XPS　measurement　suggests　the　density　of　states　for　valence　band　rises　with　the　increase　of　aging　time　from　0　to　20min,　while　valence　band　edge　is　slightly　shifted　to　a　low　binding　state.　When　the　aging　time　exceeds　20min,　the　electron　structure　tends　to　be　in　a　stable　condition　gradually.　Similar　behavior　is　observed　in　both　the　relative　intensity　of　(200)　preferred　orientation　to　(220)　observed　by　XRD　and　surface　toughness　detected　by　AFM.　The　transformation　of　microstructure　was　observed.　(C)　2012　Published　by　Elsevier　B.　V.　Selection　and/or　peer　review　under　responsibility　of　Chinese　Vacuum　Society　(CVS).