The　adsorption　of　H2O,　OH,　and　O　on　the　different　sites　of　cubic　ZrO2(110)　surface　has　been　studied　with　a　periodic　slab　model　by　PW91　approach　of　GGA　within　the　framework　of　density　functional　theory.　The　results　showed　that　H2O　molecule　adsorption　on　cubic　ZrO2(110)　surface　is　dissociation　adsorption　when　the　adsorption　model　is　bridge(H-up),　and　these　H2O　molecules　form　surface　hydroxyl　groups.　The　adsorption　energy　is　150.5　kJ/mol.　The　top(H-down)　adsorption　model　is　physical　adsorption　with　an　adsorption　energy　of　14.8　kJ/mol.　The　top　site　was　found　to　be　the　most　stable　adsorption　site　for　OH　and　O,　and　the　calculated　adsorption　energy　is　241.5　and　209.1　kJ/mol,　respectively.　The　Milliken　population,　the　density　of　states,　and　the　stretch　vibrational　frequencies　have　also　been　analyzed.