Abstract: Regarding the common issue of uneven temperature distribution in resistive heating elements, this paper adopts an electro-thermal coupling simulation method to research and optimize the structure and materials of the heating elements, aiming to reduce the temperature difference across different regions. Firstly, the temperature uniformity coefficient is used as a quantitative index to evaluate the temperature uniformity of heating elements. The influence of bending structure parameters such as the bending gap width, inner chamfer, and outer chamfer of the heating element on the uniformity of temperature distribution is studied. Based on the original heating element, an optimized heating element structure that can achieve the best temperature uniformity is designed, it mainly adopts a bending structure combining an inner fillet with R₁ = 0.3 mm and an outer right angle, with a gap width of 0.5 mm. Furthermore, the influence of different PTC (Positive Temperature Coefficient) materials on the uniformity of temperature distribution is studied. The results show that the aluminum-copper alloy material with higher resistivity and higher thermal conductivity is beneficial to improving the temperature uniformity of the heating element.