Based　on　spin-polarized　density　functional　theory　and　generalized　gradient　approximation　(DFT-GGA)　calculations,　the　coverage-dependent　adsorption　of　X　bimetallic　clusters　(X=Pt-Au,　Au-Au)　on　the　(3　×　2)　TiO　2(110)　surface　has　been　investigated　utilizing　periodic　supercell　models　in　the　absence　of　oxygen　vacancy　sites.　Only　the　ground-state　structures　corresponding　to　the　given　coverage　patterns　(θ{round}=　1/6-　1　ML)　for　X　clusters　are　discussed　in　this　work.　The　unambiguous　results　reveal　that　the　adsorption　energies　increase　with　coverage　up　to　1/2　ML　and　then　decrease　except　for　when　saturated　coverage　is　reached.　According　to　the　interaction　with　X　clusters,　it　is　more　feasible　at　all　coverage　levels　to　create　a　monolayer　film　of　Pt-Au　bimetallic　clusters　on　the　TiO　2(110)　surface　than　it　is　to　create　a　monolayer　of　Au-　Au　clusters,　even　though　the　adsorption　energy　of　the　Pt-Au/TiO　2　adsorption　system　is　smaller　in　comparison　with　that　of　the　Au-Au/TiO　2　system.　Importantly,　especially　for　the　half　and　saturated　coverages,　there　is　a　broadening　of　X　peaks　overlapping　with　the　TiO　2　state　ranging　from　-　3.0　eV　to　the　Fermi　level,　suggesting　a　strong　interaction　between　the　surface　and　bimetallic　cluster.　Also　of　particular　interest　is　the　adsorptive　mechanism　where　the　X-　TiO　2　interaction　is　the　main　driving　force　at　the　initial　stage　of　the　adsorption　process,　whereas　the　X-　X　interaction　controls　the　process　as　the　coverage　increases.　©　Editorial　office　of　Acta　Physico-Chimica　Sinica.