The numerical simulations of property of SiC/Al co-continuous composites under compression with ANSYS software were carried out. Based on the simulation results, deformational behavior and distribution of stress and strain fields were analyzed. The effects of compression speed for material property was studied. The results showed that Al matrix and SiC reinforcement exhibit different mechanical behavior, large deformation appears inside Al matrix; the configuration of SiC has relatively great influence on intensity and distribution of stress within composites, its ultimate stress occurs near the interface of composites; when an external force is exerted on the composites, Al matrix and SiC reinforcement restrict each other to prevent from producing the strain; With the increase of loading velocity, the stress of matrix and the strain of reinforcement increase rapidly.