Objective To solve the non-uniform heating temperature distribution and lower-than-expected combustion efficiency of catalytic infrared emitters.Methods This study proposes a research plan that focuses on improving the mixing mode of air and fuel gas and optimizing the mixing ratio (air-fuel ratio). After measuring the temperature of the emitter surface under different operating conditions using thermocouples, this study conducts optimization experiments with average surface temperature, maximum temperature, temperature standard deviation, and heating curves as indicators.Results Compared to intra-cavity mixing, extra-cavity pre-mixing can increase the average surface temperature of the emitter by about 50 ℃, increase the maximum temperature by approximately 16 ℃, and reduce the surface temperature standard deviation by around 17 ℃. At relatively low air-fuel ratios, it can also slightly shorten the heating time. Taking the situation where the liquefied petroleum gas is at 1.3 SLPM and the air-fuel ratio is 23.3, under intra-cavity mixing, the average temperature is 527.3 ℃ and the maximum temperature is 527.3 ℃; However, under extra-cavity pre-mixing, the average temperature is 559.1 ℃ and the maximum temperature is 647.4 ℃.Conclusion Extra-cavity pre-mixing is the optimal mixing mode for air and liquefied petroleum gas, with an optimal air-fuel ratio of 23.3.