The porous SiC ceramics / Zr-based amorphous alloy composites were prepared by the pressure - infiltration casting method. The influence of pressure - infiltration casting holding time and the properities of porous SiC ceramics on the dynamic compression performance were investigated with the split Hopkinson pressure bar (SHPB) and the S-4800 scanning electronic microscope (SEM). The results showed that The dynamic compressive strength of porous SiC ceramic /Zr based amorphous alloy composites was significantly affected by the holding time and the properties of porous SiC ceramic. The composited exhibited the highest dynamic compressive strength which was1757MPa with the porosity and Average aperture size were 23.77 and 26.72um, respectively, under the condition of the pressure - infiltration casting temperature and time were 860℃ and 6.0min, respectively. The fracture mode of the composite shows the brittle fracture under the dynamic compress load. The fracture morphology characteristics included the cleavage steps appear in ceramic with different characteristics and Different patterns of veins in Zr-base amorphous alloy kept in relatively intact. The Zr-based amorphous alloy can effectively hinder cracks expansion with the surrounding silicon carbide broke up and movement with amorphous alloys, which would improve the dynamic compressive strength of porous SiC ceramic / Zr-based amorphous composites.