Abstract: In this study, single combustion and co-combustion of Lu’an coal, refuse derived fuel and rice husk were carried out in a laboratory-scaled drop tube furnace, respectively. The effects of different RDF and rice husk addition ratios on the emission of PM₁ and PM_1-10 were studied. The experimental results indicate that the PM₁ emissions were the highest when RDF combusted alone （4.85 mg/g）, while the PM₁₀ emissions from the single combustion of husk were the highest （23.37 mg/g）. During co-combustion, compared with the theoretical calculation values, the PM₁ and PM_1-10 emissions both significantly decreased when adding 5% RDF and 7.5% DK, 5% RDF and 20% DK. What’s more, the latter had the highest reduction degree and the reduction amounts of PM₁ and PM_1-10 were 62.75% and 66.96%, respectively, indicating the existence of significant interaction between particles during co-combustion, and the intensity of this interaction was related to the blending ratios. Through thermodynamic equilibrium calculations, XRF, XRD and SEM-EDS analysis of fly ash, it can be found that the amount of liquid phase substances generated during co-combustion increased by 5%-47% compared to coal combustion alone, which led to the generation of many viscous particles. The viscous Ca/K-Si-Al had the ability to capture small particles as well as alkali metals and alkali earth metals, which can effectively promote the transformation of fine particles to coarse modes.