Abstract: he experimental study was performed on tensile strength of high volume fraction SiC_P/Al composites. The results show that the loading and unloading processes have little effect on the tensile strength of high volume fraction SiC_P/Al composites. An FEM model was established to simulate the tensile properties of SiC_P/Al composites. The simulated results show that low volume fraction SiC_P/Al composites mainly represent plastic mechanical properties. On the contrary，high volume fraction SiC_P/Al composites mainly represent the brittle mechanical properties. The errors of the tensile strength got from the model are little compared with the testing results. Breakage of matrix is the main factor of high volume fraction SiC_P/Al composites tensile failure.