10mol/L　NaOH　solution　was　used　to　saponify　P507　(2-ethylhexylphosphonic　acid　mono-2-ethylhexyl　ester)　and　then　to　extract　and　strip　the　rare　earth　cerium　solution.　The　experimental　procedure　and　results　of　the　saponified　organic　phase　and　loaded　organic　phase　were　analyzed　using　IR　spectrum　and　electrical　conductivity　meter.　The　results　suggested　the　conductance　value　achieved　highest　when　the　saponified　degree　of　alkaline　solution　was　60-80%,　and　the　saponified　organic　phase　formed　a　single-phase　stable　and　uniform　microemulsion.　While　the　rare　earth　were　extracted　by　P507,　the　IR　absorption　frequency　of　P=O　decreased　while　the　absorption　intensity　increased,　suggesting　that　P=O　group　had　been　coordinated　with　the　rare　earth　ions.　More　colloidal　agglomerates　in　the　loaded　organic　phase　appeared　when　more　rare　earth　was　loaded.　©　(2013)　Trans　Tech　Publications,　Switzerland.