Cd1 - x Znx Te single crystal with different growth rate was obtained by suddenly power off during vertical Bridgman growth process.The properties of the crystalwere investigated bymeasurement of IR transmission spectrum. The result indicates that an obvious transition area of Zn concentration nearby the solid2liquid interface just before rapid cooling was observed. The distribution of crystal concentration that cooled in normal condition is comparative sym-metrical, while the grads of axes oriental concentration distribution that revealed in quick cooling crystal area is bigger. Meanwhile, we can further judge the position of solid-liquid interface by the result of X-RayMeasurement.