Abstract: The influence of ext rusion temperature on the tensile properties of 15 vol % SiC_P / Mg-9Al composite produced by powder ext rusion was investigated. The result s show that between 350～450 ℃, the mechanical propertiesof the composite such as tensile st rength , yield st rength and elongation increase with the increase of the ext rusiontemperature. At the same time , with the increase of ext rusion temperature the f racture mode changes from particle/mat rix debonding to particle f racture.