The extraction of rare earth elements La, Gd, Er with mixture of triphenylphosphine oxide (TPPO) and di-(2ethylhexyl)phosphoric acid (HDEHP) from sulfuric acid solutions has been studied. It was found that from sulfuric acid solutions, the system can enhance the extraction effect (SK 0). Enhancing effects of the extracts were influenced quite strongly by factors such as ratio, total concentration of two extracting agents, the change of H+ equilibrium concentration in solution.