In process of rare earth recovery, CaF2 makes the loss of rare earth as REF3.In order to separate the rare earth and CaF2, the leach of rare earth oxide containing CaF2 is studied, and the citric acid is used to inhibit CaF2 dissolution.The leaching technology parameters are studied.The results show that, the inhibition ratio of CaF2 increases obviously with increasing of citric acid concentration.The leaching ratio of CaF2 decreases 61%, when citric acid concentration increases to 0.25 mol·L-1.