Abstract: The research concerns in the preparation process and technical parameter of U₃O₈ powder as well as physical and chemical performance of prepared U₃O₈ powder. The effect of addition of U₃O₈ powder on the quality of UO₂ pellets was analyzed. It is concluded that U₃O₈ powder can be used to manufacture UO₂ pellet by adding in UO₂ powder Addition of U₃O₈ powder can adjust density and microstructure of UO₂ pellet, and increase metal uranium yield.