Abstract: In this work, characters of the two phase of plume in the ladle refine furnace are studied, and the mathematical representation is established to stand for the central line velocity, anypoint velosity in the two phases region of the plume, average velocity. circulative flowrate time needed by mixing ratio in the ladle refine furnace and its hydrodynamic model. The results calculated with a series of mathematical formulae deduced in this work correspond with the experimental results.