Lithium chloride solution from a plant production process containing 300~500g/l Li +, 0.04g/l Ca2+.In this research work ,the methods commonly used and their basic principles for removing calcium impurities from high concentration of lithium chloride solution were discussed.According to the magnitude of solubility product of different insoluble calcium salts, relatively simple and feasible CaC2O4 precipitation method was selected for the purpose to remove calcium.