The crystallization kinetics of the TeO2/TiO2/As2O3 glassy system was studied under nonisothermal conditions. The method was applied to the experimental data obtained by differential thermal analysis (DTA), using continuous-heating techniques. In addition, two approaches were used to analyze the dependence of glass transition temperature (T-g) on the heating rate (beta): One is the empirical linear relationship between (T-g) and (beta); The other approach is the use of straight line from the plot of ln (T-g(2)/beta) vs. 1/T-g for evaluation of the activation energy for glass transition. The crystallization results are analyzed, and both the activation energy of crystallization process and the crystallization mechanism are characterized.