Abstract: The structured high emissivity radiation surfaces are widely used in the infrared calibration, the ultra-low temperature cold source and the microwave absorbing heat sink, with the emissivity as the core index. In the design of the structured high emissivity surface, the first thing is to determine the size parameters of the structural surface, such as the height of the sharp cone and the structural angle, and then to set the high emissivity coating. Based on the classical heat transfer formula, this paper proposes a method to analyze and calculate the emissivity of the structured high emissivity surface. Simulation analysis and sample test are conducted to verify the effectiveness of the method, ensuring that this method can be used for design of the high emissivity surface in the form of cone, wedge or honeycomb.