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Deformation behavior of dual-phase Ni-31Al intermetallics at high temperature was investigated. Results show that the alloy exhibits superplastic deformation behavior at the initial strain rate of 1.25×10-4- 8×10-3 s-1 and in the temperature range of 950-1075 oC. A maximum elongation of 281.3% is obtained at 5×10-4 s-1 and 1000 oC. Microstructure analyses show that the dual phases have excellent compatible deformability during the superplastic deformation process. The initial coarse microstructure becomes much longer and finer after superplastic deformation. The superplastic phenomenon in dual-phase Ni-31Al can be explained by continuous dynamic recovery and recrystallization