The　dynamic　behaviors　at　the　interface　of　carbon　dots　and　KOH　electrolyte　were　studied　using　intensity-modulated　photocurrent　spectroscopy　(IMPS)　and　intensity-modulated　photovoltage　spectroscopy　(IMVS)　in　the　photoelectrochemical　hydrogen　production　from　water　splitting.　The　results　show　that　the　kinetic　parameters　like　electron　transport　time　(T-d),　electron　diffusion　coefficient　(D-n),　electron　lifetime　(T-n),　and　electron　diffusion　length　(L-n)　remain　unchanged　in　the　light　intensity　range　of　30-90　mW.cm(-2).　When　the　light　intensity　increases　to　110　and　130　mW.cm(-2),　T-d　and　T-n　increase,　while　D-n　decreases.　It　is　indicated　that　the　photogenerated　electrons　are　mainly　transported　in　the　trap-free　limited　diffusion　mode　at　the　electrode/electrolyte　interface　due　to　the　presence　of　few　defects　in　carbon　dots,　which　is　different　from　the　mode　of　transport　at　the　semiconductor　TiO2/electrolyte　interface.　Moreover,　the　photocarrier　collection　efficiencies　(eta(cc))　associated　with　the　electron　transport　time　and　the　electron　lifetime　are　similar　for　light　intensity　of　30-130　mW.cm(-2).