The dynamic compression testing of Mg65Cu20Ag5Gd10 bulk amorphous alloy was done by split Hopkinson pressure bar （SHPB） at the scope of strain rate of 10^2- 10^3 s^-1. The fracture morphologies of Mg65Cu20Ag5Gd10 bulk amorphous alloy were studied by scanning electron microscopy. The results show that the most fracture strength value is 704 MPa of the Mg65Cu20Ag5Gd10 bulk amorphous alloy under dynamic compression and no macro-plastic phase during deformation process; the fracture strength of Mg65Cu20Ag5Gd10 bulk amorphous alloy has rise trend with a rise in the air pressure of shooting bullet, the fracture strain falls with a rise in compression load; the cleavage step exists on the fracture which proves the Mg65Cu20Ag5Gd10 bulk amorphous alloy to be brittle fracture, meanwhile the strip pattern and slip area are found on the fracture morphology.
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