(C)ompression test of SiCw/6061Al at the temperatures around the solidus of matrix alloy has been studied. Compression flow stress increases with increasing strain late according to a power law sigma = K(epsilon) over dot (m). At temperatures lower than the solidus of matrix, the m value is 0.32 and the activation energy of deformation is almost the same as that of aluminum seif-diffusion, indicating a dislocation motion controlled by lattice diffusion deformation mechanism of the composite. At temperatures slightly higher than the solidus of the matrix, the rn value is 0.5 and the activation energy of deformation is much higher than that of the self-diffusion of aluminum, indicating a grain boundary and interfacial sliding deformation mechanisms of the composite.