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Solvent extraction of Np(V) from mtnc acid solution by n-octyl(phenyl)-N, N-diisobutylcarbamoylmethylphosphine oxide (CMPO) in the presence and absence of tri-n-butyl phosphate (TBP) has been studied using decalin and n-dodecane as diluents. Without the TBP, Np(V) can be extracted using CMPO in decalin with extraction equation:Np0icaJ+N03caJ+2CMPOcoJ=Np02(N0,)2CMPOco>. The maximum N p( V) distribution ratio using 0.65 M CMPO in decalin from 2M nitric acid is 4. The net effect of TBP to CMPO at 2M nitric acid is slight suppression of Np(V) distribution ratio. However, at low CMPO concentration (0.2M::2) after the Np(V) distribution ratio reaches the minimum value, the distribution ratio gradually increases as the TBP concentration increases. No synergistic interaction of CMPO and TBP has been observed.