The dissolution behavior of actinide and fission product metals into THF with 10 vol% Br2 was examined in this study. The solubilities of niobium, ruthenium, rhodium, zirconium and molybdenum in both aerated and nitrogenated THF solutions with 10 vol% Br2 are negligible. On the other hand, the solubilities of lanthanum, neodymium, samarium and strontium in aerated and nitrogenated THF solutions with 10 vol% Br2 are large. Among metals examined in this study, uranium had the largest solubility in nitrogenated THF with 10 vol% Br2 and under this condition uranium will be separated from other metals. In the nitrogenated organic solution U(IV), U(V) and UO22+ (VI) coexist, while only UO22+ (VI) exists in the aerated organic solution.