Zr46.3Cu43.3Al8.9Si1.5 (at%) bulk metallic glass was prepared by copper mould casting. The crystallization behavior of the alloy in continuous heating was investigated by differential canning calorimeter (DSC). The characteristic temperature apparent activation energy and the local activation energy were calculated by the Kissinger and Doyle equations, respectively. The results show that the activation energies of glass transition (Eg), crystallization (Ex) and peak crystallization (Ep) are 395.4 kJ/mol, 343.2 kJ/mol and 343.0 kJ/mol, respectively. With the increase of the crystallized volume fraction, the crystallization activation energy increases to the largest energy barrier, and then decreases. Zr46.3Cu43.3Al8.9Si1.5 bulk metallic glass has desirable thermal stability