The　adsorption　of　NO　on　spinel-type　CuCr2O4　(100)　surface　has　been　studied　within　the　framework　of　density　functional　theory　(DFT).　Four　possible　on-top　sites　designated　as　surface　Cu　and　Cr,　surface　O-suf　and　subsurface　O,,)　were　considered.　The　results　show　that　Cu　site　and　Cr　site　adsorptions　through　N-down　are　energetically　active　with　adsorption　energies　98.1　kJ　center　dot　mol(-1),　and　92.9　kJ　center　dot　mol(-1),　respectively.　For　active　sites,　Cu　site　and　Cr　site,　N-down　adsorption　is　preferred　than　the　O-down　one　and　the　latter　is　considered　to　be　physisorption.　The　red　shifts　for　N-O　bond　toke　place　at　the　two　orientations.　The　Mulliken　population　analysis　indicates　NO　molecules　lose　electrons.　NO　2　pi　antibonding　orbitals　get　electrons　for　adsorptions　at　Cu　site　and　Cr　site　by　means　of　density　of　states　analysis.　We　also　further　discussed　the　bonding　mechanism　for　NO　adsorptions　at　active　Cu　site　and　Cr　site　of　CuCr2O4　(100)　surface.