Choosing　pure　nickel　foil　as　the　transition　layer,　Al/0Cr18Ni9Ti　bimetallic　composite　is　prepared　with　the　vacuum　warm　compaction　diffusion　method　under　the　condition　of　480°C　compaction　temperature,　10　MPa　pressure　and　1.0×10-2　Pa　vacuum.　The　structures　and　performances　of　the　two　bimetallic　composite　bonding　interfaces　and　matrix　are　analyzed　respectively　with　scanning　electron　microscope,　X-ray　diffractometer　and　Vickers　microhardness　scale.　It　is　found　that　under　the　condition　of　diffusion　bonding,　three　kinds　of　intermetallic　compounds,　Al3Ni2,　Al3Ni　and　Al3Ni5,　form　in　the　Al/Ni　interface　less　than　4　μm　in　thickness;　and　no　intermetallic　compound　forms　in　the　Ni/0Cr18Ni9Ti　diffusion　zone　with　about　8　μm　in　thickness.