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We have investigated the structural and optical properties of ZnO/TiO2 hetero-structures thin film with various zinc acetate dehydrates concentration (0.5 M, 1.0 M, 1.5 M, and 2.0 M) grown by sol-gel method. Zinc oxide sol-gel were prepared by dissolving zinc acetate dehydrates as precursor into an ethanol. The solutions were added with triethanolamine as a stabilizer. For preparing the TiO2 sol-gel, titanium tetraisoproxide (TTIP) was used as precursor and it was dissolved into the ethanol and added with an acetic acid as stabilizer. A glass substrates were cleaned with acetone prior to the thin films was coated on it. The first layer was ZnO thin film and then followed by TiO2 were deposited into the glass substrates. The ZnO/TiO2 hetero-structures thin films were inserted into furnace for undertaking the heat thermal at the temperatures of 5000C for 60 minutes. X-ray diffraction was used to characterize the structural properties of ZnO/TiO2. The optical properties ZnO/TiO2 were characterized using the optical UV-Vis spectrophotometer measurement. Based on the X-RD results, the peak is clearly observed for ZnO thin films in the plane of (100), (002), and (101), indicating that ZnO in the crystalline phase, while TiO2 is in the amorphous phase. The optical band gap of the ZnO/TiO2 hetero-structures thin films for 1.0 M and 1.5 M is 3.150 eV, and 3.153 eV, respectively.