Abstract: The interfaces and microstructures of SiC_P and short carbon fiber hybrid reinforced ZA27 composites have been observed through Transmission Electron Microscope and it was found that discontinuous interfacial precipitated products of rich-copper ZnAl phase were formed at a part of areas among SiC_P and short carbon fiber and ZA27 alloy matrix. The part of interfaces between carbon fiber and ZA27 alloy matrix had a layer of carbon because of the incomplete degum of carbonfibers. Besides, the reinforcements in microareas mainly aggregated at the end of solidification position of ZA27 alloy and showed nonuniform distribution.