Abstract: The effect of phosphoric acid on extraction separation of rare earth(Ⅲ) and iron(Ⅲ)from sulphuric acid solution by primary amine N₁₉₂₃ was inve-stigated.The behavior of different primary amine and solvent or tempera-tures in dependence on the extraction seperation of rare earth(Ⅲ)was studi-ed.The mechanism of iron(Ⅲ)extraction from phosphciic acid solution was proposed.The IR study was carried out for the organic phase.