Determination is made by titration or aas and other instrumental analysis methods. PVC abrasive is a kind of thermoplastic with amorphous resin structure, which is mainly obtained by grinding. By using muffle furnace combustion method and specific gravity determination method, the approximate content of calcium carbonate in profile formula can be known. The determination of calcium content is mainly through digestion of samples to obtain digestion solution, and then through titration or aas and other instrumental analysis methods.