Abstract: A superalloy with low stacking fault energy includes by mass fraction 0.01%˜0.09% of C, 23.5%˜27.5% of Co, 11%˜15% of Cr, 0.1%˜1.8% of W, 2.2%˜2.6% of Al, 3.5%˜5.5% of Ti, 0%˜2% of Nb, 0%˜2% of Ta, 2.1%˜3.5% of Mo, 0.0001%˜0.05% of B, 0.0001%˜0.05% of Zr, 0%˜2.5% of Fe, 0%˜0.04% of Mg, 0%˜0.02% of Hf, and a balance of Ni, wherein a sum of the mass fractions of Nb and Ta is ?0.8%. The superalloy is capable of service performance above 750° C. and good thermal processing characteristics, and is usable for structural members for long-term use, for example a turbine disc, a blade, a casing, a combustion chamber, etc. The superalloy has a structural member and an application thereof.