Thiophene　adsorption　on　the　(111)　surfaces　of　Pd　and　Pt　have　been　investigated　by　density　functional　theory.　The　results　indicate　that　the　adsorption　at　the　hollow　sites　is　the　most　stable.　To　our　interest,　the　molecular　plane　of　thiophene　ring　is　distorted　with　C=C　bond　being　elongated　to　1.450　angstrom　and　C-C　bond　being　shortened　to　1.347　angstrom,　and　the　C-H　bonds　tilt　13.91　similar　to　44.05　degrees　away　from　this　plane.　Furthermore,　analysis　on　population　and　density　of　states　verified　the　calculated　adsorption　geometries.　Finally,　charge　analysis　suggests　that　thiophene　molecule　is　an　electron　acceptor,　reflecting　the　interaction　between　the　lone　pair　of　sulfur　and　the　d-orbitals　of　metal.