The　grafting　reaction　of　tetrabutyl　tin　(SnBu4)　on　surface　of　Pt/HY　molecular　sieve　supercages　was　studied　in　vacuum.　Composition　and　structure　of　the　resultant　were　characterized　by　FTIR,　XRD,　UV-Vis,　TPR,　TPD,　TG,　BET,　ICP,　elemental　analysis　and　GC-MS.　SnBu4　could　react　with　superficial　hydroxy　group　of　Pt/　HY　molecular　sieve,　to　result　selective　and　quantitative　grafting　of　SnBu3　fragments　onto　surface　of　molecular　sieve　supercages　without　deteriorating　crystalline　structure　of　the　latter.　Grafted　Pt/HY　molecular　sieve　was　quite　different　from　the　original　in　adsorption　behavior.　The　modified　Pt/HY　molecular　sieve,　as　catalyst,　was　used　in　hydrogenation　of　furfural　to　furfuryl　alcohol.　Selectivity　of　the　alcohol　on　modified　Pt/HY　molecular　sieve　with　tetrabutyl　tin　was　higher　than　that　on　unmodified.