We have investigated the crystal structure, magnetic and electrical properties of (Tb1-xNax)MnO3 (x = 0 and 0.15). These materials have been prepared in polycrystalline by solid-state reaction. The orthorhombic structure with space group Pbnm is observed in these materials. (Tb1-xNax)MnO3 samples exhibit paramagnetic to antiferromagnetic transition temperature of ~ 10 K and ~ 20 K for x = 0 and x = 0.15 samples respectively. The corresponding transition temperature is increased with increasing Na content. Moreover, a decrease in E +W value from 62 meV (x = 0) to 38 meV (x = 0.15) was found. This may be due to the reduction of activation energy and resistivity in the parent compound by Na substitution.
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