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Rare earth co-permeation of (N H4)3 [CrMo6 O24 H6]·7H2O was reported and the conductivity of (N H4)3 [CrMo6O24 H6]was improved by 6.734× 109 times. X-ray fluorescence spectrometry (XRF), thermogravimetry-differential thermal sample. Experimental results showed that Nd could be permeated into the body of this sample and the XRD patterns showed great difference between (NH4)3[CrMo6O24H6]·7H2O and permeated sample. The structure of (NH4)3[CrMo6O24H6]·7H2O was destroyed and new compound MoN perhaps formed.