An electrodeposition-calcination route was designed for the preparation of Zn/ZnO dendrites in this work. Zn dendrites were first deposited at room temperature via a potentiostatic electrodeposition route at the potential of -1.5 V for 10 min. Then, Zn/ZnO dendrites were obtained through calcining Zn dendrites in air at 100-400 degrees C for 30 min. The produced Zn/ZnO dendrites were labeled as Zn/ZnO-N (N = 100, 200, 300 and 400). The investigations showed that the as-obtained Zn/ZnO-200 dendrites exhibited the strongest photocatalytic activity for the reduction of Cr (VI)-Cr (III) under the radiation of 460 mW cm(-2) white light from a Xenon lamp. Within 16 min, similar to 92% of Cr (VI) was reduced when Zn/ZnO-200 was used as the photocatalyst. Also, the as-obtained Zn/ZnO-200 catalyst owned good stability. After six cycles, the catalytic efficiency had only slight decrease, which is favorable for reducing the cost in the practical application.