Abstract: The distribution coefficients of Am(Ⅲ) and Eu(Ⅲ) by di-(2-ethylhe-xyl)phosphoric acid(HDEHP) from nitric acid solution were measured as a function of the diluent, concentration of extractant, acid in aqueous phase and aluminium nitrate or sodium nitrate. The distribution coefficients of Sr (Ⅱ) were also measured-for the same system as a function of nitric acid concentration and extractant concentration. For practical purpose, the extraction properties of purified HDEHP have been compared with those of the commercial reagent. Finally, several conditions were suggested for multistage counter current test.