In this paper, MnCr₂O₄with spinel structure has been prepared by using polymeric precursor method. The thermal stability, grain size and surface morphology of MnCr₂O₄calcined at different temperatures were studied using thermogravimetric analysis and differential scanning calorimeter analysis (TG-DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM). Then the YSZ-based sensors using MnCr₂O₄sintered at different temperatures (800, 900, 1000, 1100 and 1250 °C) as electrode were fabricated and their NO₂sensing properties were investigated. Results demonstrate that MnCr₂O₄sample calcined at 1000 °C exhibits higher response to 100 ppm NO₂, which is about 73 mV. It is believed that the calcined temperature affect the material's sensing properties. In addition, the sensing characteristics such as selectivity, repeatability were investigated.