Titania-silica was synthesized by rapid hydrolysis of Ti(OPr(i))4 and Si(OEt)4, and the state of titanium and epoxidation activity of this mixed oxide were investigated. XANES analysis showed that the amount of tetrahedrally coordinated titanium increased with a decrease in the titanium content. The epoxidation activity increased in accordance with the decreased amount of tetrahedral titanium sites. The amount of Lewis acid sites also increased with the decrease in titanium content. Thus the tetrahedral titanium was responsible both for the epoxidation activity and the Lewis acidity due to its coordinatively unsaturated nature.