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The extraction equilibrium of four rare earth ions (REn+, n =3 or 4) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-irnidazolium hexafluorophosphate ([Bmim]PF6) ionic liquid as extraction solvent and 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (HPMBP, HP) as extractant.The extraction percentage could be higher than 99%.The extracted species in the REn+-[Bmim]PF6-HP system was neutral REPn (n =3 or 4) and complete recovery of REn+ extracted into [Bmim]PF6 can be achieved using diluent HCl as stripping agent.[Brnim]PF6 can be recycled in the experiment.The extraction equilibrium constants and the pH1/2 values of four Res and their separation factors between adjacent rare earths were estimated and comparatively studied.