The　SiC　honeycomb/　Al-Mg-Si　composite　with　interpenetrated　microstructure　was　prepared　by　spontaneous　infiltration　of　Al-8wt%　Mg-7wt%　Si　alloy　into　directional　porous　SiC　honeycomb　served　as　reinforcement.　The　microstructure　and　anisotropic　thermophysical　properties　of　this　composite　were　also　examined.　The　results　showed　that　the　initial　microstructure　of　the　SiC　honeycomb　can　be　retained　and　the　as-prepared　SiC　honeycomb/　Al-Mg-Si　composite　exhibited　significantly　anisotropic　characteristics.　Meanwhile,　the　alloying　treatment　on　the　Al　matrix　can　avoid　the　generation　of　Al4C3　and　promote　the　wettability　between　Al　and　SiC.　Particularly,　the　directional　porous　SiC　honeycomb　with　such　a　low　ceramic　content　(19　vol.%)　made　it　possible　for　the　composite　to　have　a　higher　thermal　conductivity　(138.3　W/(m.K))　in　the　axial　direction　and　a　lower　coefficient　of　thermal　expansion　(11.40x10(-6)/K)　in　the　radial　direction.　The　influences　of　the　SiC　honeycomb　reinforcement　on　the　anisotropic　thermophysical　properties　were　also　studied　by　the　theoretical　models　in　comparing　with　the　experimental　results.