After the synthesis of tobermorite from potassium feldsparof Lushi County, Henan Province, the authors successfully prepared potassium carbonate from the mother solution. The solution was acidified by CO2 and concentrated by vaporizing after the removal of residue by filtration. When the density increased to 1.444 1 mg/L, the ethanol was added to the solution to reduce the solubility of potassium bicarbonate. Thus, the potassium carbonate was prepared. The electronic class K2CO3 prepared by the filtrated solution is up to GB/T1587-2000Ⅱ specification.