In the present study, the coarsening behavior of γ? phase at different temperatures and the compression property of a novel Co–Ni–Al–W superalloy was investigated. The evolution of the mean radius and volume fraction of the γ? phase indicates that the coarsening behavior follows the classical Lifshitz-Slyozov-Wagner (LSW) model. The coarsening rate of the γ" phase exhibits a significant dependence on the aging temperature, increasing from 1.30×10_-27 ^m₃^{/s at 800 ℃ to 9.56×10}_-27 ^m₃/s at 900 ℃. The activation energy of γ? phase, influenced mainly by W diffusion in the γ matrix, is found to be 210 kJ/mol. In particular, the studied Co-Ni-Al-W alloy possesses a good combination of a high γ? solvus temperature of 1221 ℃ and a low density of 8.7 g/cm3. Besides, compression yield strength of the developed Co-Ni-Al-W alloy at ambient and high temperatures are higher than those of other recently γ?-strengthened Co-based superalloys.