Aluminum　oxide　(Al2O3)　is　a　widely　used　ceramic　material　known　for　its　high-temperature　stability,　which　makes　it　valuable　in　a　variety　of　industrial　applications.　The　conversion　from　bulk　to　surface　modification　may　lead　to　substantial　changes　in　their　thermodynamic　properties.　Consequently,　this　study　endeavors　to　resolve　the　primary　thermodynamic　properties　of　Al(2)O(3　)by　employing　DFT　calculation.　The　FP-LAPW+lo　method　is　first　used　in　the　WIEN2K　software　to　determine　the　surface　of　bulk　Al(2)O(3　)with　varying　thicknesses.　The　thermodynamic　parameters　of　Al(2)O(3　)at　high　pressure　and　elevated　temperature,　such　as　bulk　modulus,　thermal　expansion　coefficient,　heat　capacity,　entropy,　enthalpy　and　Debye　temperature　are　investigated　with　the　help　of　the　quasi-harmonic　Debye　model　in　the　Gibbs2　package.　The　calculated　thermodynamic　parameters　of　the　Al(2)O(3　)agree　with　earlier　findings.　The　results　reveal　that　with　increasing　thickness,　the　thermal　expansion　coefficient　and　entropy　decrease　while　the　enthalpy　increases,　indicating　that　Al2O3　can　be　a　suitable　candidate　for　various　energy　and　electronic　industrial　applications.