Dye-sensitized　solar　cells　(DSSCs)　are　performed　using　C3N4　post-treated　TiO2　particles　as　photoanode　materials.　The　photoanode　materials　were　synthesized　via　a　simple　method　by　which　a　thin　layer　of　C3N4　was　coated　onto　the　surface　of　TiO2　particles　after　the　TiO2　was　dipped　in　urea　solution　followed　by　calcination　properly.　The　experimental　results　show　that　the　photoelectric　conversion　efficiency　of　the　TiO2　DSSCs　is　remarkably　improved.　The　measurements　of　I-V　characteristic　along　with　the　analysis　of　electrochemical　impedance　spectroscopy　indicate　that　the　C3N4　layer　can　expand　the　visible　light　absorption,　suppress　the　recombination　reaction　of　the　e(-)-h(+)　pair　and　increase　both　the　open　circuit　voltage　and　the　short-circuit　photocurrent　density.　The　mechanism　of　the　improved　performance　of　TiO2　DSSCs　by　C3N4　coating　coating　is　proposed.　The　post-treatment　method　recorded　in　this　work　can　be　easily　operated　and　achieve　an　enhanced　photoelectric　performance　of　DSSCs.