Abstract: The SiC_P/AZ91 composite was fabricated by stir-casting and then processed by equal channel angular pressing (ECAP) at different temperature successfully. No obvious SiC_P clusters and porosities are observed in the cast SiC_P/AZ91 composite. Most SiC_P particles are segregated at a microscopic scale near the grain boundary regions, which is typical "necklace-type" particle distribution for SiC_P/AZ91 composite fabricated by stir casting. With increasing of ECAP passes, the SiC_P distribution is improved and no obvious particle broken is discovered in SiC/AZ91 after ECAP. The grains of the AZ91 matrix are refined gradually due to the dynamic recrystallization. The matrix grain refinement and the improved particle distribution result in the increase of tensile yield strength and ultimate strength of the composite during ECAP processing.