The　adsorption　and　decomposition　of　H2S　on　the　ZnO　(0001)　surface　have　been　investigated　with　first-principles　calculations.　The　results　reveal　that　H2S　is　dissociatively　adsorbed　on　the　clean　ZnO　(0001)　surface　to　generate　HS-　and　hydrogen　species.　To　our　interest,　as　indicated　by　Mulliken　charge　and　density　of　states　of　the　configuration　calculation,　the　bonding　mechanism　of　H2S　on　the　ZnO　(0001)　surface　can　involve　the　donation　of　charge　from　the　＂s　lone　pairs＂　into　the　surface　and　the　back　donation　of　surface　electrons　to　H2S.　Therefore,　the　electrons　should　play　an　important　role　in　decomposition.　Furthermore,　the　reactivity　of　H2S　adsorption　and　further　thermal　decomposition　reactions　on　the　ZnO　(0001)　surface　have　also　been　discussed　by　calculating　the　possible　reaction　pathways.　As　expected,　H-2　will　be　easily　generated　during　the　decomposition　process.