A 3D FE model of the cracked aluminum plate bonded by carbon fiber composite is proposed and validated when the plate is with biaxial loading. The efficiency of composite repair is investigated too. The effect of composite patch, ply sequence, length of patch and the ratio of loading on the stress intensifying factor (SIF) of the cracked plate is studied. It is shown that there exists coupling effect between the two applied loading and the efficiency of the composite repair is affected by the ratio of loading. The SIF of plate is reduced when the tensile loading is applied parallel to the crack while the SIF is increased when the compressive loading is applied perpendicularly to the crack.