Visible-light-induced hydrogen production remains a challenge.Great interest has been paid on the sacrificial systems containing three components, i.e.photosensitizer (S), electron relay (R) and catalyst (C) [1,2].Compared with terpyridyl ligand (N(∧)N(∧)N),6-phenyl-2,2-bipyridine ligand (H(∧)C(∧)N(∧)N) shows more preference for planar geometry and discourage the D2d distortion.The extended π system within the H(∧)C(∧)N(∧)N and the strong σ-donating power of the deprotonated carbon donor would increase the energy gap between the metal-centred d-d state and the metal-to-ligand charge transfer (MLCT) state.These advantages within the ligand (H(∧)C(∧)N(∧)N) suggested its complex could be a promising candidate for photocatalytic generation on hydrogen applications.Herein, we report the efficiency comparison for photocatalytic generation of hydrogen of both complexes with ligand H(∧)C(∧)N(∧)N and N(∧)N(∧)N respectivly.Cyclometalated platinum(Ⅱ) complex, [ClPt(C(∧)N(∧)NPhMe)] (HC(∧)N(∧)NPhMe =4-(p-tolyl)-6-phenyl-2,2-bipyridine) was fotmd to be an efficient photosensitizer for photocatalytic hydrogen evolution from water, 98 turnovers of hydrogen were obtained after 10 h irradiation of solution containing MV2+, TEOA, photosensitizer and colloidal Pt, which is far effective than the platinum(Ⅱ) terpyridyl complex [ClPt(N(∧)N(∧)NPhMe)]ClO4 (N(∧)N(∧)NPhMe =4-(p-tolyl)-2,2:6,2"-terpyridine).Net photocatalytic reduction of MV2+ by the complexes in the presence of triethanolamine in CH3CN/H2O solvents were observed and compared upon irradiation (λ > 400 nm).We conclude that cyclometalated platinum(Ⅱ) complexes [ClPt(C(∧)N(∧)NPhMe)] could act as a more efficient photosensitizer for generation of H2 from water.