In order to measure the emissivity of the mixed surface,a series array as emissivity samples are designed,which are deep continuous gradient cavity array and divided into 5 units.The series of emissivity is obtained by using infrared thermal imager to capture thermal images at the upper end of the emissivity sample.The emissivity is obtained by theoretical calculation.Through the experimental measurement of the surface emissivity of the unit,the theoretical calculation and experimental measurements are compared,the influence of deep continuous tapered cavity array on the surface emissivity at different heating temperatures is discussed.The results show that with the increase of heating temperature,the surface emissivity of the deep continuous tapered cavity array will decrease;with the increase of cavity depth,the surface emissivity of the deep continuous tapered cavity array will increase.