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The effect of γ-phase on two-way shape memory effect (TWSME) of polycrystalline Ni56Mn25-xCoxGals.9Gd0.1 alloys was investigated.The results show that an appropriate amount of ductile γ-phase significantly enhances the TWSME.The largest TWSME of 1.4% without training is observed in Ni56Mn21Co4Ga18.9Gd0.1 alloy,and this value is increased to 2.0% after thermomechanical training.The as-trained TWSME decays over the first five thermal cycles and then reaches a stable value as the number of cycles further increasing.Only the degradation of 0.2% is observed after 100 thermal cycles.The better TWSME and thermal stability are ascribed to the stable extra stress field formed by the plastically deformed γ-phase.