Abstract: The effects of reaction temperatures,potassium carbonate dosage,reaction time and particle size of microcline on the thermal dissociation rate of the system of K-feldspar and potassium carbonate are investigated.The orthogonal experiment shows the optimum reaction temperature 860℃;the ration of K-feldspar:K₂CO₃=1∶12;the optimum reaction time 1 0h;particle size of raw material 60～80 mess.In addition,the process is analyzed by thermal analysis of TG and DTA,and the baked materials were analyzed by X-ray diffraction.With the above analysis,the dissociation mechanism is proposed.