Abstract: In this paper,the interface of short alumina fiber reinforced aluminium alloy composite manufactured by the infiltration method was studied.T he results indicate that there are obvious interface layers between the fiber and the matrix in the composites,and the alloy elements may improve the interface wettability by suitable chemical reaction between the fiber and the matrix.The analysis of the specimen fracture also indicates that the bonding between fiber and matrix is strong enough to transmit loading from matrix to fiber so as to play a reinforcing role of the fibers.