The present paper reports a comparative study of some thermo-physical properties (thermal conductivity. diffusivity and specific heat per unit volume) of Se90Zn10 and Te90Zn10 alloys. Simultaneous measurements of effective thermal conductivity (X-e) and effective thermal diffusivity (X-e) of twin pellets of Se90Zn10 and Te90Zn10 alloys using transient plane source (TPS) technique have been made at room temperature. From the measured values of lambda(e) and X-e, the specific heat per unit volume (C-v) has been calculated. The results indicate that the measured values of these Parameters are higher for Te90Zn10 alloy as compared to Se90Zn10 alloy. This is explained in terms of thermal conductivity of chalcogen elements Se and Te. (C) 2008 Elsevier B.V. All rights reserved.