Density　functional　theory　and　slab　model　are　used　to　investigate　methanol　adsorption　and　decomposition　on　SnO2(110)　surface.The　obtained　result　shows　the　most　favorite　adsorption　site　for　methanol　is　the　fivefold-coordinated　tin　atoms.The　hydrogen　atom　was　broken　from　hydroxyl　group　and　bounded　to　t...