Abstract: The influence of intergranular carbide precipitation on the mechanical properties of hot-forged high manganese steel was investigated using optical microscopy and conventional mechanical property testing methods. The experimental results indicate that the precipitation of intergranular carbides significantly affects the mechanical properties of forged high manganese steel, particularly the impact energy at room and low temperatures. With grain refinement and a reduction in intergranular carbide precipitation, the overall plasticity index of forged high manganese steel shows an increasing trend, and the impact energy (at room and -40°C) will be significantly increased by 6-7 times. Eliminating intergranular carbide precipitation can enhance plasticity and greatly improve toughness at room and low temperatures. Under the premise of ensuring no or minimal carbide precipitation, austenite grains can be further refined through process optimization (such as controlling forging and solution treatment temperatures), which is expected to further enhance the strength and toughness of the material based on its current optimal performance..