The interface of the SiCp/Al composites produced by powder metallurgy processing involving hotpressing above the matrix solidus temperature has been investigated by means of TEM. Several kinds of interfaces between the reinforcements and the matrix in the composite, including the clean interfaces, the faceted interfaces and the slight reaction intedeces, are presented. And most of interfaces belong to the slight reaction interfaces which are composed of the Al with different orientation from the Al matrix near the interface zone and particte-like substances produced by MgAl2O4 spinels and impurities The interface of the SiCp / Al composites produced by powder metallurgy processing with hotpressing above the matrix solidus temperature has been investigated by means of TEM. Several kinds of interfaces between the reinforcements and the matrix in the composite, including the clean interfaces, the faceted interfaces and the slight reaction intedeces, are presented. And most of interfaces belong to the slight reaction interfaces which are composed of the Al with different orientation from the Al matrix near the interface zone and partic-like substances produced by MgAl2O4 spinels and impurities