Effects　of　titanium　surface　oxidation　oil　titanium-ceramic　adhesion　were　investigated.　Cast　pure　titanium　was　Subjected　to　pre-oxidation　and　introduction　of　an　intermediate　layer　of　Silo,　by　Sol-gel　process.　Specimen　surfaces　were　characterized　by　XRD　and　SEM/EDS.　The　adhesion　between　the　titanium　and　porcelain　was　evaluated　by　three-point　flexure　bond　test.　A　rutile　layer　is　formed　oil　the　titanium　Surface　after　pre-oxidation.　Failure　of　the　titanium-procelain　with　pre-oxidation　treatment　predominantly　occurs　at　the　titanium-oxide　interface.　Pre-oxidation　treatment　does　not　affect　the　fracture　mode　of　the　titanium-porcelain　system.　The　rutile　layer　is　more　strongly　bonded　to　the　porcelain　than　titanium.　The　poor　adhesion　of　the　rutile　with　substrate　is　due　to　the　thermal　stress　arising　from　the　large　lattice　mismatch　and　difference　in　coefficient　of　thermal　expansion　between　Ti　and　rutile　during　cooling.　However,　a　thin　and　coherent　SnO(x)　film　with　small　spherical　pores　obtained　after　heat-treated　at　300　degrees　C　serves　as　all　effective　oxygen　diffusion　harrier　to　improve　titanium　adhesion.　The　SnO(x)　films　change　the　fracture　mode　of　the　titanium-porcelain　system　and　improve　the　mechanical　and　chemical　bonding　between　porcelain　and　titanium-procelain,　resulting　in　the　increased　bonding　strength　of　titanium-procelain.