Abstract: Using 2-methylimidazole and ZnO nano sheets as raw materials, sheet ZnO/ZIF-8 heterojunction composites were synthesized by hydrothermal method in this work.The samples were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscopy(SEM).The gas sensing performance of the samples was systematically studied by gas sensing performance tester, and the possible mechanism of the enhanced gas sensing performance of ZnO/ZIF-8 was further discussed.The results of gas sensing performance analysis show that the optimum working temperature of ZnO/ZIF-8 is 160℃, lower than that of pure ZnO (its optimum working temperature is 180℃).At the optimum operating temperature, ZnO/ZIF-8 exhibited excellent selectivity for n-butanol, with a response of 76.778 to 200 ppm n-butanol.In the concentration range of 5-200 ppm n-butanol, the sensitivity of ZnO/ZIF-8 is approximately linear in correlation with the concentration, with good repeatability and stability, which is suitable for detecting low concentration n-butanol gas.