Establishing efficient co-catalytic loaded semiconductors for efficient charge separation is a hopeful way for enhance photocatalytic water splitting hydrogen evolution. Herein, we successfully constructed the Cd0.5Zn0.5S/Ni2P (CZS/Ni2P) nanocomposites via two-step hydrothermal method. The CZS/Ni2P composites show much improved activity than the origin CZS for photocatalytic H-2 generation. When the content of Ni2P loaded on the Cd0.5Zn0.5S (CZS) is 0.3 mol%, the photocatalyst achieves the highest photocatalytic hydrogen generation rate of 41.26 mmol g(-1) h(-1) under visible light. The Ni-S bonds on the close contact interface between CZS and Ni2P can be act as electron-bridge to provide a channel for electron transfer. During the photocatalysis processing, Ni2P can be used as electron traps to attract electrons from CZS, resulting in the improvement of the photo catalytic performance. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.