In this paper, the effects of density of localized exciton states on stimulated emission processes have been reported. In our experiments, two samples of Zn x Cd 1-x Te ZnTe mutiple quantum wells which with different concentration are employed, and the stimulated emissions from the localizid states are observed in each of them. The density of localized exciton states in Zn 0.67 Cd 0.33 Te ZnTe MQWs is much greater than that in Zn 0.78 Cd 0.22 Te-ZnTe MQWs. The stimulated emission processes was found to be an exciton-ecciton scattering processes, but it was not found in Zn 0.78 Cd 0.22 Te-ZnTe MQWs. It seems to be very important for localized exciton to create stimulated emissions, but too high density of localized exciton states may greatly affect the stimulated emissions.