On account of on the dominant performance of Ni2P, rGO and g-C3N4 itself, with a view to conquer the disadvantages of Ni2P, rGO and g-C3N4 its own, the g-C3N4/rGO/Ni2P is successfully designed and prepared by a simple hydrothermal reaction, which is used in dye sensitized system for high-efficient photocatalytic H-2 evolution. The rGO is adhered to the outside appearance of the g-C3N4 nanosheets and fish-scale shape Ni2P is anchored on the surface of rGO and g-C3N4. The above three forms a synergistic effect. The maximum amount of H-2 evolution reaches about 266 mu mol for 5 h over the g-C3N4/rGO/Ni2P photo-catalyst when the content of rGO is 8%, which is 10.6 times higher than g-C3N4. Synergy between the above three materials is certified by some characterizations and the results of which are consistent with each other. In addition, the possible mechanism of photo-catalytic hydrogen production is proposed. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.