A new column extraction chromatographic method for aonoentrating trace amounts of lanthanide elements in yttrium oxide has been recommended.Naphthenic acid is used as a stationary phase and silicon-treated porous silica-gel beads are used as a carrier,and the elnant used is dilute hydrochloric acid.The difficulty that the naphthenio acid would flow ont too early is avoided by packing the porous silica-gel beads with naphthenic acid in to the glass column in the dry form.The process of separation can be followed visually by adding an acid-base indicator.It takes,about 12 hours for the whole separation process.The trace amount of lanthanide elements is concentrated by a factor of 20.