Interfacial　features　and　interfacial　thermal　conductivity　of　three　kinds　of　metal　matrix　composites　(MMC)　have　been　comparatively　studied　by　the　scanning　thermal　probing　with　the　micro-sized　special　resolution.　The　statistical　method　was　used　to　process　and　translate　topographic　and　thermal　voltage　data　of　scamming　thermal　microscopy　(SThM).　The　data　of　interfacial　width　and　interfacial　thermal　conductivity　were　obtained.　The　results　reveal　that　the　macro　thermal　conductivity　of　the　MMC　can　be　critically　dependent　on　the　reinforcing-matrix　interfacial　thermal　conductivity-.