||The photocatalyst BiTa1-xCuxO4 is prepared by the flux method by mixing the different proportions of Ta2O5、Bi2O3 and CuO and adding K2SO4 and Na2SO4 flux to raise to the required preparation temperature. With the temperature elevating rate of 1 0C/min, and maintaining for 1 hour natural cooling to the room temperature, the powder of photocatalysts BiTa1-xCuxO4 were obtained after washing with the distilled water and dring in vacuum filtration. All the prepared catalysts were loaded with RuO2 co-catalyst to become RuO2 / BiTa1-xCuxO4 photocatalysts. The photocatalystic characterization of prepared photocatalyst was investigated with the X-ray diffraction (XRD), UV - Visible Spectrometer (UV-Vis), Energy Dispersed Spectrometer (EDS),and Scanning Electron Microscope (SEM). From the XRD results, it could be known that the BiTa0.98Cu0.02O4 photocatalysts possess the best crystalline structure under 600 0C calcination,and with the increase of X in BiTa1-xCuxO4 photocatalysts, the diffraction peaks shift more to the wide-angle.From the UV-Vis results, it could be known that with the increase of in BiTa1-xCuxO4 photocatalysts, the absorption band edges showed obvious red shift. From the EDS results, it could be known that the composition of the prepared photocatalysts was identified as BiTa1-xCuxO4. From the SEM results, it could be known that the particle sizes of photocatalysts changed with the increase of preparation temperature, while prepared under 600 0C calcination, the catalysts possessed uniform grain size, and the particle sizes of photocatalysts increased with the increase of CuO content. The water-splitting reaction with the BiTa1-xCuxO4 photocatalysts for hydrogen production was carried out in a batch reaction with the addition of the sacrificial reagent CH4 under the irradiation of 450W metallic halogen lamp. From the experimental results, the highest photocatalystic reactivity for the water-splitting reaction was obtained by the BiTa0.98Cu0.02O4 photocatalyst, which was prepared at 600 0C calcination having the highest hydrogen evolution rate of 232 μmole/h. In addition,as the photocatalyst is loaded with co-catalyst RuO2 of 0.3wt%,the hydrogen producing rate can reach to 1562 μmole/h.