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Heterogeneous catalysts have been developed for C—C coupling reactions,but stand low activity and al-ways proceed under harsh conditions.Photocatalytic Stille cross-coupling reaction as a green catalytic method for C—C bond formation is of great interest for a wide range of scientists but still lacks stable and highly efficient cata-lysts.Herein,we have designed an Au nanoparticle-graphitic carbon nitride heterojunction as an outstanding photo-catalyst for artificial photosynthesis in Stille cross-coupling reaction.The interface effect between metal and semi-conductor makes electron rectify and prevents the recombination of electron-hole pairs.Moreover,the efficiency of Au nanoparticle catalysts could be adjusted by gold contents.Thus the turnover frequency(TOF)value reached the highest level of 788 h-1 over the optimal heterojunction catalyst.Most importantly,the C—C bond formation reaction has been proved to be carried out well under visible light irradiation,indicating the low-cost organic synthesis pro-cess.Further analysis confirmed the stability and general application of our heterogeneous Au nano-heterojunction catalyst.