This study aims to investigate the effects of interfacial debonding and fiber volume fraction on the stress -strain behavior of the fiber reinforced metal matrix composites subjected to off -axis loading .The generalized method of cells ( GMC) is used to analyze a representative element whose fiber shape is circular .The constant compliant interface model (CCI) is also adopted to study the response of composites with imperfect interfacial bonding .Results show that for the com-posites subjected to off-axis loading ,the mechanical behaviors are affected appreciably by the interfacial debonding and the fiber volume fraction .