Ti35Zr30Be27.5-xCu7.5Cox（x=3.5

7.5

11.5

mole fraction） bulk amorphous alloys were prepared by copper mold casting method. The effects of Co content on the thermal stability were investigated using X-ray diffractometer（XRD） and differential scanning calorimeter（DSC）. The results show that the glass transition temperature（Tg）

the crystallization temperature（Tx） and the exothermic peak temperature （Tp） are shifted to the high temperature region with the increase of heating rate for Ti35Zr30Be27.5-xCu7.5Cox（x=3.5

7.5

11.5） bulk amorphous alloys

which shows that the glass transition and crystallization are characterized by kinetic processes.The activation energies of glass transition（Eg） and crystallization（Ex） are increased with Co content increases by the Kissinger method. The activation energies of glass transition（Eg） and crystallization（Ex） are 207.8 kJ/mol and 238.1 kJ/mol

respectively

for Ti35Zr30Be16Cu7.5Co11.5 bulk amorphous alloy.