||The photocatalyst (CuIn)xCd2(1-x)S2 is prepared by the flux method by mixing the different proportions of Cu2S, In2S3 and CdS and adding of Na2SX 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 (CuIn)xCd2(1-x)S2 were obtained after washing with the distilled water and dring in vacuum filtration. All the prepared catalysts were loaded with Pt(0.5%) co-catalyst to become Pt /(CuIn)xCd2(1-x)S2 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 (CuIn)0.05Cd1.90S2 photocatalysts possess the best crystalline structure under 600 0C calcination,and with the increase of X in (CuIn)xCd2(1-x)S2 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 (CuIn)xCd2(1-x)S2 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 (CuIn)xCd2(1-x)S2. From the SEM results, it could be known that the particle sizes of photocatalysts increased 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 CuInS2 content. The water-splitting reaction with the (CuIn)xCd2(1-x)S2 photocatalysts for hydrogen production was carried out in a batch reaction with the addition of the sacrificial reagent Na2S(0.25M)/K2SO¬3(0.35M) 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 Pt(0.5%)/(CuIn)xCd2(1-x)S2 photocatalyst, which was prepared at 600 0C calcination having the highest hydrogen evolution rate of 1291 μmole/h.