Due to the large proportion of the inclusions, it''s hard to remove the inclusions such as hafnium oxide in the cast superalloy containing hafnium. In this research, DZ125 superalloy revert was melted by high energy electron beam to remove refractory inclusion, and the composition, microstructure and distribution of slag collected from different positions after electron beam melting were analyzed. The results show that the surface of the final zone of the ingot mainly contains large-sized oxide inclusions and MC carbides, no oxide inclusions are found in different positions inside the ingot, and large-sized HfO₂ is found in the slag in the hearth. The high energy electron beam has a stirring effect on the molten pool, which makes a large number of HfO₂ and Al₂O₃ gather together and float to the surface of the ingot under the action of the electron beam, so the refractory oxide inclusion in the revert can be effectively removed.