The solubility of K3VO4 in the KOH-K3VO4-Ca(OH)(2)-H2O system and subsystems at (313.2 and 353.2) K were studied in a wide alkali concentration range, varying from 5 % to 45 % KOH. From the data, it is concluded that the K3VO4 solubility decreased obviously with the addition of Ca(OH)(2) when the KOH concentration is low. Also, the calcification of K3VO4 can be achieved efficiently only in this KOH concentration range. The precipitate phase is mainly presented as Ca10V6O25, and the element K in the K3VO4 can be recovered as KOH. Besides, temperature is not the primary impact factor for the behavior of K3VO4 calcification.