To fully harness the hot deformation capabilities of the FGH4113A superalloy and ascertain the influence of different initial microstructures on its hot deformation behavior and microstructural evolution, the hot compression curves and deformed microstructures were investigated under various hot deformation conditions for FGH4113A superalloy in three states: Hot Isostatic Pressing (HIP, as A1), HIP+ Hot extruded at 1100℃(A2), and HIP+ Hot extruded at 1150℃(A3). The results show that A2, extruded at 1100℃ with uniformly γ+γ′ microduplex microstructures, demonstrated commendable hot deformation behavior at both 1050℃ and 1100℃. The true stress-strain curves of A2 maintained a prolonged hardening-softening equilibrium over an extended strain range, with post-deformation average grain sizes being within 5μm. On the other hand, the HIP-conditioned A1 and the 1150℃ extruded A3 exhibited a softening region in deformation curves at 1050℃, and the grain microstructures reflect an incomplete recrystallized state—a blend of fine recrystallized grains and the initial larger grains, forming a necklace-like microstructure. The predominant recrystallization mechanism for these samples was identified as strain-induced boundary migration. At 1150℃ with a strain rate of 0.001s-1, the impact of the initial microstructure on hot deformation behavior and resultant microstructure was relatively subtle, with post-deformation microstructures predominantly showcasing large, fully recrystallized grains. Fine-grained microstructures are conducive to maximizing the alloy"s hot deformation potential. By judiciously managing deformation regimes, a fine and uniform deformed microstructure can be obtained.