Loading　noble　metal　on　the　surface　has　been　widely　used　to　improve　photocatalytic　activity　of　semiconductor　photocatalyst.　Here,　Pt-embedded　anatase　(A)-rutile　(R)　TiO2　junction　photocatalyst　(A/Pt/R)　was　found　to　show　much　more　efficient　photocatalytic　H-2　evolution　activity　than　the　other　TiO2　photocatalysts　loading　Pt　on　the　outside　surface　(such　as　Pt/A/R,　Pt/A,　Pt/R　and　Pt/P25),　although　the　asembedded　Pt　is　unreachable　to　reactants.　The　A/Pt/R　sample　shows　a　photocatalytic　H-2　evolution　rate　as　high　as　17.9　mmol.g(cat)(-1).h(-1),　which　is　27.2　and　2.5　times　higher　than　the　common　A/R　and　Pt/A/R　samples,　respectively.　The　traditional　theory　fails　to　explain　the　unexpected　high　photoactivity.　The　reverse　tandem　Schottky　junction　is　suggested　to　be　possibly　responsible　for　the　high　photoactivity　of　A/Pt/R,　which　allows　the　photogenerated　electrons　to　transfer　more　swimmingly　from　rutile　to　anatase　than　the　common　A/R　phasejunction.　This　finding　provides　a　new　strategy　for　further　promoting　photocatalytic　activity　of　Pt/TiO2　and　other　heterophase　or　heterojunction　photocatalysts.　(C)　2019　Elsevier　Inc.　All　rights　reserved.