Abstract: CdZnTe single crystal growth process with vertical Bridgman method was modeled. The influences of temperature gradient and growth rate were investigated on solid-liquid interface and solute segregation of CdZnTe crystal. It shows that both temperature gradient and growth rate can change the pattern and the intensity of the convection in the melt near the solid-liquid interface significantly.With the increase of temperature gradient and the decrease of the growth rate, the concavity of the solid-liquid interface decreases a lot, the radial solute segregation of the crystal improves appreciably, the iso-concentration lines is nearly parallel to the radial. On the contrary, the axial solute segregation is enhanced, the length of the axial iso-concentration zone reduces obviously.