Photocatalytic hydrogen production from methanol aqueous solution containing mixture of titanium dioxide (TiO 2 ) and graphite silica (GS) was enhanced by laser ablation in liquid. It was found that the amount of hydrogen gas evolved in lased GS–TiO 2 was less than that in raw GS–TiO 2 mixture. However, the amount of hydrogen gas with the mixture of raw TiO 2 and lased GS was two times as large as that of the raw GS–TiO 2 mixture. This enhancement effect may be attributed to increase in the reaction surface area by the fine-subdivided GS particles and the aggregation of lased GS and raw TiO 2 .