The coarsening behaviors of γ″-phase particles in Inconel 718 alloy aged at 750, 800, and 850℃ were investigated by scanning electron microscopy(SEM). Detailed observations and quantitative measurements were conducted to characterize the coarsening behavior of the γ″-phase under various aging conditions. The experimental results indicate that the existence of the δ-phase retards the formation and coarsening of the γ″-phase, without influencing its final particle size or amount. Moreover, when cold rolled with a reduction of 50%, the dimensions of the γ″ particles in Inconel 718 alloy decrease with increasing aging time. Furthermore, the coarsening behavior of the γ″-phase in the Inconel 718 alloy after a normal aging treatment(sample A) and that of the primary δ-phase(sample B) follow the Lifshitz–Slyozov–Wagner(LSW) diffusion-controlled growth theory; the thus-obtained activation energies for the γ″-phase are 292 k J·mol~(-1)and 302 k J·mol~(-1), respectively. The coarsening behaviors of γ “-phase particles in Inconel 718 alloy aged at 750, 800, and 850 ° C. were investigated by scanning electron microscopy (SEM). Detailed observations and quantitative measurements were conducted to characterize the coarsening behavior of the γ” -phase under various aging conditions. The experimental results indicate that the existence of the δ-phase retards the formation and coarsening of the γ “-phase, without influencing its final particle size or amount. Furthermore, when cold rolled with a reduction of 50% the dimensions of the γ ”particles in Inconel 718 alloy after with normal aging treatment (sample A) and that of the primary δ-phase (sample B) follow the Lifshitz-Slyozov-Wagner (LSW) diffusion-controlled growth theory; the thus-obtained activation energies for the γ "-phase are 292 kJ · mol -1 and 302 kJ · mol ~ (-1), respective ly.