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Process of adding yttrium into the melt is not a common method for ODS RAFM steel production.In this paper,the oxide dispersion strengthened steel(9Cr-ODS)was prepared by adding Y(mass fraction 0.25%)or Y(mass fraction 0.25%)and Ti(mass fraction 0.1%)directly into 9Cr steel through vacuum induction melting.Optical microscopy(OM)is used to count the size and number of the second phase particles,and scanning electron microscopy(SEM)is used to examine the types of the second phase particles,and transmission electron microscopy(TEM)is used to measure the composition of smaller second phase particles.Size of most of inclusions in casting is micron level.