Time-resolved　photoconductivity(　TRPC)　was　used　to　study　the　photoconductivity　decay　of　TiO2　and　the　lifetime　of　the　photogenerated　charge　carriers.　Also,　we　investigated　the　influence　of　platinum　loading　on　the　characters　of　the　photogenerated　charge　carriers　of　TiO2.　The　results　showed　that　the　decay　tendency　of　TiO2　was　delayed　with　the　increase　of　platinum　loading　and　the　effective　lifetime　of　the　photogenerated　charge　carriers　of　TiO2　containing　1.0%　Pt(mass　fraction)　was　prolonged　to　1.　57　ms　from　0.　16　ms　without　Pt　loading.　The　mentioned　results　suggested　that　in　the　presence　of　Pt　the　photogenerated　electrons　of　TiO2　transfer　to　Pt　from　semiconductor　rapidly,　resulting　in　achieving　the　effective　separateness　between　the　photogenerated　electrons　and　holes,　prolonging　the　effective　lifetime　of　the　photogenerated　carriers,　decreasing　the　recombination　rate　of　photogenerated　electrons　and　holes,　and　increasing　the　quantum　efficiency　of　the　photocatalytic　reaction.