In order to understand cutting mechanism of amorphous alloy, chip formation and cutting force of Zr41.2Ti13.8Cu12.5Ni10.0Be22.5bulk metallic were investigated during machining process with different cutting depth by using SEM X-ray diffraction and cutting force measurement system. It is interesting that very good plasticity occurs during machining Zr-based BMG as compared to complete brittleness in tension. The chip morphology is unique and shows presence of plastic shear bands. The main cutting force Fz gets increased with the increase of cutting depth, however the values of Fx and Fy are almost constant at the same time.