Influence of T6 heat treatment （solution treatment＋aging） on the microstructure and compressive property of SiC/Al double-interpenetrating composite were investigated. Results showed that the compressive strength of composites treated by T6 treatment increases obviously, but the elastic module and the plasticity decrease because of the morphology shape to fine particle and the strengthening of the change of eutectic silicon in matrix from coarse needle precipitation Mg2Si phase after T6 treatment. The compressive strength of composites get the peak value when the solution time is 8 hour for eutectic silicon is fining. The compressive strength is decreasing with the augment of aging time for the residual stress, density of dislocation and the strengthening of Mg2Si on the matrix fall.
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