Oxide glasses have unique thermal properties. In the present work, it was investigated that how the thermal properties vary with composition. In this work, the ternary glasses of the form 40TeO₂-(60-x)V₂O₅- xNiO with different molar percentage 0≤x≤20 have been prepared by standard rapid melt-quenching method. DSC curves of these ternary glasses have been investigated in the range (150- 500^oC) at heating rates φ=3, 6, 9, 10 and 12K/min. Then, using their crystallization temperature (T_cr) and Avrami index (n), their crystallization activation energy (E_c) were calculated. Generally, results of this work show that the decreasing trend of crystallization activation energy, which can be attributed to the increasing of non-bridging oxygen's and increasing of fragility. The obtained values of (n) show that it fluctuates around n≈ 1, which can be attributed to surface or one-dimensional crystal growth of probably needle-like tellurium crystals.