This paper reports spectroscopic and thermal studies of cadmium doped manganese borate glasses of composition of x CdO - (40- x) MnO2 - 60 B2O3 prepared by melt quenching method. The influence of cadmium ions on physical and spectroscopic properties in the glasses were analysed using FTIR and TG-DTA. XRD traces suggest the amorphous nature of the samples prepared. FTIR spectrum confirms the presence of BO3 and BO4 units and the variations brought about by the modifying action of cadmium oxide. Thermal behavior and the stability of the system are understood by the TG-DTA studies.