This study suggested a new method to treat water-soluble wastes containing both of radioactive and non-radioactive elements. Using the raw materials of ceramic waste form, precipitation reaction with metal chlorides was carried out. It was investigated on the content of radioactive elements, Cs and Sr, in the precipitates, with changing the Ca(OH)2/H3PO4 molar ratios and the concentration of metal chlorides. From the results, it would be reached that calcium phosphate compound takes Cs and Sr into its crystal structure without a significant Li uptake and the structure of precipitates are apatitic. Silicate anion selectively reacted with Sr and rare earth metal.