A method of determination of rare earth elements in plant foods by Inductively Coupled Plasma Mass Spectrometry was established.The microwave digestion conditions and ICP-MS operating parameters were optimized.First,the samples were digested by closed vessel microwave HNO3+H2O2+HF system,Rh、Re were used as internal standard to determine 15 kinds of rare earth elements including La 、Ce、Pr 、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu and Y.In order to verify the accuracy and reliability of the method,two standard substances celery and green onion were tested and compared with the certified values.The detection limit range was from 7.0 μg/L to 18.6 μg/L depending on the rare earth elements,and RSD of the method varied between 0.7% and 3.9% for a set of eleven replicates.