Abstract: Aiming at controlling particulate matter formation and Na behavior during the conversion of Zhundong coal, experiments were conducted in a drop-tube furnace to investigate the formation characteristics of particulate matter and the contribution of Na during pulverized Zhundong coal reacting in devolatilization, combustion and gasification conditions. The impacts on the particulate matter formation and the capture of Na by adding kaolin in the three environments were also studied. The results show that a certain amount of Na vaporizes during devolatilization, but char combustion and subsequent ashing are still the most important stages for Na evaporation. Gasification enhances Na evaporating as Na Cl. Adding kaolin can effectively reduce the formation of submicron particles during coal devolatilization, combustion and gasification. While performing well under various conditions, kaolin capturing Na in the gas phase is the most effective during coal gasification.